✔ 最佳答案
Let x be the number of apples bought ( note that's the same as the number of pears)
so
x apples at $6 each and $36 left means John has money of
6x + 36
x pears at $12 each and short of $18 means
12x - 18
Note that they are both equals the amount of money John has
so equating them gives
6x + 36 = 12x - 18
taking away 6x from both side gives
36 = 6x -18
addd 18 to both sides gives
54 = 6x
divided by 6 from both sides gives
x = 9
so John bought 9 apples.
2013-11-30 12:17:25 補充:
JEI YUEN LONG MATH & ENGLISH
JEI 元朗