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數學(英文) 唔識 15~(非常急)
要算式A watch is marked at $1200 by a manufacturer. The watch is sold at 15%discount to a shopkeeper. The shopkeeper marked the price of the watch as $X and offer a 10% discount. After the shopkeeper sold the watch, he made a 20% profit.Find the value of XA hawker bought 360 eggs which originally cost $0.5... 顯示更多 要算式 A watch is marked at $1200 by a manufacturer. The watch is sold at 15%discount to a shopkeeper. The shopkeeper marked the price of the watch as $X and offer a 10% discount. After the shopkeeper sold the watch, he made a 20% profit.Find the value of X A hawker bought 360 eggs which originally cost $0.5 each at a discount of 20%. He threw away 40 rotten eggs. Then he sold 250 egg at a marked price of $0.6 each and the rest at a discount of 20%on the marked price.Fine A)the total cost of the egg, B)the total selling price, C)the profit per cent. Tommy worked in a bank.He borrowed $250000 from the bank at R% p.a. simple interest and agreed to repay all the money one year later. After six months, Tommy owed the bank $255000 and he resigned at that time. The bank then added 6% p.a. to the interest rate. Find the amount that Tommy owed the bank when the loan was due. The cost of an apple is $4 and that of an orange is $5.Alice buys 6 apples and X orange. If Alice pays exactly $59 in total, how many orange does she buy? Donna's father gave her $P for pocket money. She useu $m every day. After n days, she has $A left. A)Write down formula to find A using P,m and n In a country, if we take a taxi, the fare $5 for the first 2km and $2 for every 1km in the remaining journey. Mr Wong took a taxi from his home to an airport and the journey was Xkm in total. A)The distance between Mr Wong's home and the airport was more than 2km. Express required fare in term of X B)If Mr Wong paid a fare of $41 , how long is the journey in total? C)If Mr Wong took a taxi at the airport and travelled 30km to a train station how much do he pay The sum of two number is 120. If 10 is subtracted form the larger number, hen the difference is 4 times the smaller number. Find the two number A bag contains some $5 and $10 coins. There are altogether 120 coin in the bag and the total amount is $810. Find the number of $5 coins and that of $10 coin in the bag.
最佳解答:
With regard to the shopkeeper, the cost of the watch is $1200 * (1 - 15%) = $1020 Selling price of the watch by the storekeeper = $X * (1 - 10%) = $0.9X Profit percentage = (0.9X - 1020)/1020 * 100% = 20% 0.9X - 1020 = 204 0.9X = 1224 X = 1360 A)the total cost of the egg = 360 * 0.5 * (1 - 20%) = $144 B)the total selling price = 250 * 0.6 + (360 - 40 - 250) * 0.6 * (1-20%) = 150 + 70 * 0.6 * 0.8 = 150 + 33.6 = $183.6 C)the profit per cent = (183.6 - 144)/144 * 100% = 27.5% The money that Tommy owed the bank after six months is $250000 * (1 + R%/2) = $255000 1 + R%/2 = 1.02 R%/2 = 0.02 R% = 0.04 = 4% For the second half year period, the interest rate is 4% + 6% = 10% The interest for the second half period = $250000 * 10%/2 = $12500 Total money due = $255000 + $12500 = $267500 Cost of 6 apples = $4 * 6 = $24 Cost of X oranges = $59 - $24 = $35 Total number of oranges X = $35/$5 = 7 A)Write down formula to find A using P,m and n P = mn + A A = P - mn A)For the first 2km, the fare is $5. The remaining journey is (X - 2) km The fare for the remaining journey = (X - 2)(2) = 2X - 4 Fare = 5 + 2X - 4 = $(2X + 1) B)If Mr Wong paid a fare of $41 , how long is the journey in total? 2X + 1 = 41 2X = 40 X = 20 The journey is 20km C)The fare is 2*30 + 1 = $61 Let the bigger number be X Then the smaller number is 120 - X (X - 10) = 4(120 - X) X - 10 = 480 - 4X 5X = 490 X = 98 120 - X = 22 The two numbers are 98 and 22 Let the number of $5 coins be X Then the number of $10 coins is 120 - X Total amount = 5X + 10(120 - X) = 810 5X + 1200 - 10X = 810 5X = 390 X = 78 120 - X = 42 There are 78 $5 coins and 42 $10 coins.
其他解答:
數學(英文) 唔識 15~(非常急)
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發問:要算式A watch is marked at $1200 by a manufacturer. The watch is sold at 15%discount to a shopkeeper. The shopkeeper marked the price of the watch as $X and offer a 10% discount. After the shopkeeper sold the watch, he made a 20% profit.Find the value of XA hawker bought 360 eggs which originally cost $0.5... 顯示更多 要算式 A watch is marked at $1200 by a manufacturer. The watch is sold at 15%discount to a shopkeeper. The shopkeeper marked the price of the watch as $X and offer a 10% discount. After the shopkeeper sold the watch, he made a 20% profit.Find the value of X A hawker bought 360 eggs which originally cost $0.5 each at a discount of 20%. He threw away 40 rotten eggs. Then he sold 250 egg at a marked price of $0.6 each and the rest at a discount of 20%on the marked price.Fine A)the total cost of the egg, B)the total selling price, C)the profit per cent. Tommy worked in a bank.He borrowed $250000 from the bank at R% p.a. simple interest and agreed to repay all the money one year later. After six months, Tommy owed the bank $255000 and he resigned at that time. The bank then added 6% p.a. to the interest rate. Find the amount that Tommy owed the bank when the loan was due. The cost of an apple is $4 and that of an orange is $5.Alice buys 6 apples and X orange. If Alice pays exactly $59 in total, how many orange does she buy? Donna's father gave her $P for pocket money. She useu $m every day. After n days, she has $A left. A)Write down formula to find A using P,m and n In a country, if we take a taxi, the fare $5 for the first 2km and $2 for every 1km in the remaining journey. Mr Wong took a taxi from his home to an airport and the journey was Xkm in total. A)The distance between Mr Wong's home and the airport was more than 2km. Express required fare in term of X B)If Mr Wong paid a fare of $41 , how long is the journey in total? C)If Mr Wong took a taxi at the airport and travelled 30km to a train station how much do he pay The sum of two number is 120. If 10 is subtracted form the larger number, hen the difference is 4 times the smaller number. Find the two number A bag contains some $5 and $10 coins. There are altogether 120 coin in the bag and the total amount is $810. Find the number of $5 coins and that of $10 coin in the bag.
最佳解答:
With regard to the shopkeeper, the cost of the watch is $1200 * (1 - 15%) = $1020 Selling price of the watch by the storekeeper = $X * (1 - 10%) = $0.9X Profit percentage = (0.9X - 1020)/1020 * 100% = 20% 0.9X - 1020 = 204 0.9X = 1224 X = 1360 A)the total cost of the egg = 360 * 0.5 * (1 - 20%) = $144 B)the total selling price = 250 * 0.6 + (360 - 40 - 250) * 0.6 * (1-20%) = 150 + 70 * 0.6 * 0.8 = 150 + 33.6 = $183.6 C)the profit per cent = (183.6 - 144)/144 * 100% = 27.5% The money that Tommy owed the bank after six months is $250000 * (1 + R%/2) = $255000 1 + R%/2 = 1.02 R%/2 = 0.02 R% = 0.04 = 4% For the second half year period, the interest rate is 4% + 6% = 10% The interest for the second half period = $250000 * 10%/2 = $12500 Total money due = $255000 + $12500 = $267500 Cost of 6 apples = $4 * 6 = $24 Cost of X oranges = $59 - $24 = $35 Total number of oranges X = $35/$5 = 7 A)Write down formula to find A using P,m and n P = mn + A A = P - mn A)For the first 2km, the fare is $5. The remaining journey is (X - 2) km The fare for the remaining journey = (X - 2)(2) = 2X - 4 Fare = 5 + 2X - 4 = $(2X + 1) B)If Mr Wong paid a fare of $41 , how long is the journey in total? 2X + 1 = 41 2X = 40 X = 20 The journey is 20km C)The fare is 2*30 + 1 = $61 Let the bigger number be X Then the smaller number is 120 - X (X - 10) = 4(120 - X) X - 10 = 480 - 4X 5X = 490 X = 98 120 - X = 22 The two numbers are 98 and 22 Let the number of $5 coins be X Then the number of $10 coins is 120 - X Total amount = 5X + 10(120 - X) = 810 5X + 1200 - 10X = 810 5X = 390 X = 78 120 - X = 42 There are 78 $5 coins and 42 $10 coins.
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