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4 December, 09:56

A bag contains green marbles and blue marbles, 36 in total. The number of green marbles is 4 more than 3 times the number of blue marbles. How many green marbles are there?

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  1. 4 December, 10:07
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    Number of blue marbles = n

    number of green marbles = 3n+4

    n+3n+4=36

    4n+4=36

    4n=32

    n=8

    sub n=8 into 3n+4

    =3 (8) + 4

    =24+4

    =28

    therefore there are 28 green marbles
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