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