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Method 1 :
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
 
Method 2 :
Before —
local : non-local
2u : 1u
 
After —
local : non-local
4u : 1u
 
4u – 2u = 2u ——- 156
1u ——- 156/2 = 78
3u ——- 78 x 3 = 234
 
Ans : 234 stamps.
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