The number of stamps that Kaye and Alberto had was in the ratio of $5:3$ respectively. After Kaye gave Alberto $10$

The number of stamps that Kaye and Alberto had was in the ratio of $5:3$ respectively. After Kaye gave Alberto $10$ of her stamps, the ratio of the number of Kaye had to the number of Alberto had was $7:5.$ As a result of the gift, Kaye had how many more stamps than Alberto.

A. 20
B. 30
C. 40
D. 60
E. 90

Answer: C

Source: GMAT Prep

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