標題:
Mathematics Revision Test
發問:
11. In the figure, ΔABC~ΔFDE. Find y.圖片參考：http://imgcld.yimg.com/8/n/HA01113436/o/701108090123413873439770.jpg A. 8B. 9C. 10D. 1625. Johnny bought some foods in a supermarket. Johnny paid $41 for 6 packs of biscuits and 2 bags of potato chips. If $11.5 is needed for 1 pack of biscuits and 1 bag of potato... 顯示更多 11. In the figure, ΔABC~ΔFDE. Find y. 圖片參考：http://imgcld.yimg.com/8/n/HA01113436/o/701108090123413873439770.jpg A. 8 B. 9 C. 10 D. 16 25. Johnny bought some foods in a supermarket. Johnny paid $41 for 6 packs of biscuits and 2 bags of potato chips. If $11.5 is needed for 1 pack of biscuits and 1 bag of potato chips, what are the price of a pack of biscuits and the price of a bag of potato chips?
最佳解答:
1.B 2.Let $x be the price of 1 pack of biscuits and $y be the price of 1 bag of potato chips x+y=11.5...(1) 6x+2y=41..(2) x=11.5-y...(3) Sub (3) into (2), 6(11.5-y)+2y=41 69-6y+2y=41 69-41=4y y=7 x+7=11.5 x=4.5 Price of 1 pack of biscuits: $4.5 Price of 1 pack of potato chips: $7 Hope that I can help you :D
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其他解答:
because triangle ABC similar to triangle FDE. AB/FD=AC/FE=BC/DE(corr.sides,similar triangles) 6/y=8/12 y=9(D) 25.let x be the price of a pack of biscuits and y be the price of a pack of a potato chips. 6x+2y=41------(1) x+y=11.5------(2) (2)*2 2x+2y=23------(3) (1)-(3), (6x+2y)-(2x+2y)=41-23 4x=18 x=9/2 sub x=9/2 into (1) 6(9/2)+2y=41 27+2y=41 2y=14 y=7 therefore the price of a pack of biscuits=$4.5 and a pack of potato chips=$7.
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