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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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This is a Before After question.

   Before  Transfer  After     
Tara 1u – 36 1u – 36  
Violet  1u + 36 1u + 36  

(1u – 36)/ 7 = (1u + 36)/13

13u – 468 = 7u + 252

13u – 7u = 252 + 468

6u = 720

1u = 720 ÷ 6 = 120 stamps each

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