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Question

Need to solve this question using ratio method. Please help. Thanks.

Answer

Cindy : 1u
Jing Jing : 4u

(1u – 5)/(4u – 5) = 2/11
11 x (1u – 5) = 11u – 55 ——- 2 x (4u – 5) = 8u – 10
11u – 8u = 3u ——- 55 – 10 = 45
1u ——- 45/3 = 15
4u ——- 15 x 4 = 60

Ans : $60.

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they spent same $5 amount. Something did not change before and after……

their difference. 

                 Cindy     Jing      Diff

Before        1               4             3

After           2               11            9

try to rework the difference in units to 9u (diff is 9u Before and also 9u After) for above and then analyse the changes in terms of u. 

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