標題:
Maths problem[ Percentages]
發問:
1. If A is 50% greater than B, then what percentage of A+B is A-B? [ans. 20%] 2. If x is 60% more than y, by what percentage is y less than x? [ans. 37.5%] 3. If A is 70% of B, and C is 30% greater than A, what percentage of B is C ? [ans. 91%] Can anyone calculate them in details? thx!
最佳解答:
1)A is 50% greater than B , so A = 1.5B A+B = 1.5B + B = 2.5B A-B = 1.5B - B = 0.5B percentage of A+B is A-B = (A-B)/(A+B) * 100% = 0.5B / 2.5B * 100%= 0.5/2.5 * 100%= 20% 2)x is 60% more than y , so x = 1.6y percentage is y less than x = (x-y)/y * 100% = (1.6y - y)/1.6y * 100% = 0.6 / 1.6 * 100% = 37.5% 3) A is 70% of B , so A = 0.7B C is 30% greater than A , so C = 1.3A = 1.3(0.7B) = 0.91B C = 0.91B C/B = 0.91 percentage of B is C = C/B * 100% = 0.91 * 100% = 91% 2009-07-09 19:56:06 補充： For Q2 ,it should be percentage is y less than x = (x-y)/x * 100%
其他解答:
Maths problem[ Percentages]
發問:
1. If A is 50% greater than B, then what percentage of A+B is A-B? [ans. 20%] 2. If x is 60% more than y, by what percentage is y less than x? [ans. 37.5%] 3. If A is 70% of B, and C is 30% greater than A, what percentage of B is C ? [ans. 91%] Can anyone calculate them in details? thx!
最佳解答:
1)A is 50% greater than B , so A = 1.5B A+B = 1.5B + B = 2.5B A-B = 1.5B - B = 0.5B percentage of A+B is A-B = (A-B)/(A+B) * 100% = 0.5B / 2.5B * 100%= 0.5/2.5 * 100%= 20% 2)x is 60% more than y , so x = 1.6y percentage is y less than x = (x-y)/y * 100% = (1.6y - y)/1.6y * 100% = 0.6 / 1.6 * 100% = 37.5% 3) A is 70% of B , so A = 0.7B C is 30% greater than A , so C = 1.3A = 1.3(0.7B) = 0.91B C = 0.91B C/B = 0.91 percentage of B is C = C/B * 100% = 0.91 * 100% = 91% 2009-07-09 19:56:06 補充： For Q2 ,it should be percentage is y less than x = (x-y)/x * 100%
其他解答:
此文章來自奇摩知識+如有不便請留言告知
thx so much!
文章標籤
全站熱搜
留言列表
