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Question

The number of local stamps in a collection was 2/3 of the total number of stamps. After 156 local stamps were added to the collection, the number of local stamps became 4/5 of the total number of stamps. How many stamps were there in the collection at first?

Answer

local stamps ——- 2u
total stamps ——- 3u
(2u + 156)/(3u + 156) = 4/5
5 x (2u + 156) = 10u + 780 ——- 4 x (3u + 156) = 12u + 624
12u – 10u = 2u ——- 780 – 624 = 156
1u ——- 156/2 = 78
3u ——- 78 x 3 = 234

Ans : 234 stamps.

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At first, LOCAL : FOREIGN = 2 : 1

In the end, LOCAL : FOREIGN = 4 : 1

2u = 156

1u = 78

3u = 234

0 Replies 2 Likes
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