The no. of stamps that Kaye & Albert had were in the ratio 5:3. After Kaye gave Albert 10 of her stamps, the ratio of the no. of stamps kaye had to the the no. Albert had was 7:5. As a result of this gift, Kaye had how many more stamps than Albert?
A. 20
B. 30
C. 40
D. 60
E. 90
Since all of the answer choices are multiples of 10, and Kaye and Albert exchange 10 stamps, the number of stamps for each is almost certainly a MULTIPLE OF 10.
Before the exchange of 10 stamps, K:A = 5:3, implying the following options:
K=50, A=30
K=100, A=60
K=150, A=90
K=200, A=120.
After Kaye give Albert 10 stamps, check which option yields the required ratio of 7 to 5:
K=40, A=40
K=90, A=70
K=140, A=100.
We can stop here, since 140:100 = 14:10 = 7:5.
Thus, after the exchange of 10 stamps, K-A = 140-100 = 40.
The correct answer is
C.
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