PP1 DS Q121

[nemolee]

121 12194-!-item-!-187;#058&008148
Pat bought 5 pounds of apples. How many pounds of pears could Pat have bought for the same amount of money?
(1) One pound of pears costs $0.50 more than one pound of apples.
(2) One pound of pears costs 1 又1/2 times as much as one pound of apples.

ANS: B


請問(2) 是不是在說洋離1磅的成本是１磅平果的3/2倍?
如正確的算出答案？　

謝謝

[Huang Hsin-Yi]

設apple為 $a, pear為$p
當用買五磅apple的錢,可以買x磅的pear
therefore 5a=xp 求x磅

(1) p=a+0.5 代入上式........................insufficient
(2)p=1.5a 代入上式 可求出x..............sufficient