ratio
2007-04-17 12:45 am
tea A and tea B are mixed in the ratio x:y by weight. A costs $80/kg and B costs$100/kg. If the cost of A is increased by 10% and that of B is decreased by 12%, the cost of the mixture per kg remains unchanged. Find x:y.
回答 (1)
2007-04-17 1:23 am
✔ 最佳答案
The old cost of mixture = 80x + 100yThe new cost of mixture = 80*1.1*x + 100*(1-0.12)*y
Since, the cost remains unchanged, so
80x + 100y = 88x +88y
12y = 8x
x:y = 12:8 = 3:2
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