SOLUTION: Alphonse has three times as many marbles as Beatrice. If Alphonse would give 15 of his marbles to Beatrice then he would have twice as many marbles as she would have. How many marb

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Question 294708: Alphonse has three times as many marbles as Beatrice. If Alphonse would give 15 of his marbles to Beatrice then he would have twice as many marbles as she would have. How many marbles must Alphonse give to Beatrice so that they each have the same number?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
a=3b
a-15=2*(b+15)
a=135 b=45
135+45=180
180/2=90
if a gave b 45 marbles they would each have 90
BTW when a gave b 15 he would have 120 and she would have 60