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29 April, 13:15

A bag contains white marbles and red marbles, 20 in total. The number of white marbles is 5 more than 2 times the number of red marbles. How many white marbles are there?

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  1. 29 April, 14:30
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    Let the number of red marbles be : x

    number of white marbles : (2x + 5)

    total number of marbles : 2x + 5 + x = 3x + 5

    3x + 5 = 20

    3x = 20-5 = 15

    x = 15/3 = 5

    since x = 5

    and

    white marbles : (2x + 5)

    no. of white marbles : 2 (5) + 5 = 15

    answer : 15 white marbles
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