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Alternatively,

At first —
Tara : Violet : Total
1 : 1 : 2
10 : 10 : 20

After —
Tara : Violet : Total
7 : 13 : 20

10 – 7 = 3 or 13 – 10 = 3
36/3 = 12
12 x 10 = 120

Ans : 120 stamps.

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