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题库 / GMATAdvanced-PS-4
The table above shows the average(arithmetic mean) price per dozen eggs sold in a certain store during three successive months. If 2/3 as many dozen were sold in April as in May,and twice as many were sold in June as in April, what was the average price per dozen of the eggs sold over the three-month period?
$1.08
$1.10
$1.14
$1.16
$1.18
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这里的倍数只是单单表示个数之间的关系，而非考虑个数后总价之间的关系。不要想复杂。实际四月，五月，六月的比例是 X : Y : Z = 2 : 3 : 4
1.16=（2*1.26+3*1.2+4*1.08）/9
(1.26k+1.2*1.5k+1.08*2k)/4.5k=1.16
弄反方向了
本题没啥难度，只要注意倍数表达，别弄反了方向
设X, Y, Z表示April, May, June
2/3 as many dozen were sold in April as in May → X=2Y/3
twice as many were sold in June as in April → 2X=Z
可得X : Y : Z = 2 : 3 : 4