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11 March, 04:06

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

A. 20

B. 30

C. 40

D. 60

E. 90

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Answers (1)
  1. 11 March, 04:29
    0
    D.

    Step-by-step explanation:

    Let the number of stamps Kaye had be k and that of Alberto be a. Then we know that are in a ratio of 5 to 3.

    Hence, k : a = 5:3

    or 3k = 5a

    Then Kaye gave Alberto 10 of her stamp to make the ratio 7:5

    k - 10/a + 10 = 7/5

    Cross multiply:

    5 (k - 10) = 7 (a + 10)

    5k - 50 = 7a + 70

    5k - 7a = 120

    Let us now solve the last equation simultaneously with the equation 3k = 5a

    5k - 7a = 120

    3k - 5a = 0

    Multiply equation 1 by 3 and equation 2 by 5

    15k - 21a = 360

    15k - 25a = 0

    Subtract 1 from 2, 4a = 360

    and thus a = 90

    We know 3k = 5a

    3k = 5 * 90

    k = 450/3 = 150

    Now if we subtract 90 from 150, this yields 60
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