Summer Clouds moderators
24/11/2017 at 13:44-
The sum marbles now is:
20 + 40 = 60 [marbles]
The sum marbles after add purple marbles is:
40 : 5 . 12 = 96 [green marbles]
The number of purple marbles after add purple marbles is:
96 - 40 = 56 [marbles]
So we need add:
56 - 20 = 36 [purple] to 5/12 of the marbles will be green
Selected by MathYouLike