Question
Luis, Billy and Rael have some buttons. The ratios of their buttons are as follows:

Luis : (Luis + Billy + Rael) = 3 : 7
Billy : (Luis + Rael) = 1 : 5

Rael has 100 buttons more than Billy. In the end, Rael gives away all he has to Billy and Luis so that both Billy and Luis end up with the same number of buttons, how many buttons has Luis received from Rael?
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Luis, Billy and Rael have some buttons. The ratios of their buttons are as follows:

Luis : (Luis + Billy + Rael) = 3 : 7
Billy : (Luis + Rael) = 1 : 5

Rael has 100 buttons more than Billy. In the end, Rael gives away all he has to Billy and Luis so that both Billy and Luis end up with the same number of buttons, how many buttons has Luis received from Rael?