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Before —
Jane : 8u
May : 1u

After —
Jane : 8u – 25 ——- 3p
May : 1u + 25 ——- 1p

8u – 25 ——- (1u + 25) x 3 = 3u + 75
1u ——- (75 + 25)/(8 – 3) = 20
9u ——- 180

Ans : 180 stamps.

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