SOLUTION: I gave a third of them to tina then I gave half of what I had left to tom I have 12 marbles left how many marbles did I start with

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Question 1129096: I gave a third of them to tina then I gave half of what I had left to tom I have 12 marbles left how many marbles did I start with
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
m marbles to start with

m-m%2F3-%281%2F2%29%28m-m%2F3%29=12
m-m%2F3-%28m%2F2-m%2F6%29=12
m-m%2F3-m%2F2%2Bm%2F6=12
multiply both sides by 6.
6m-2m-3m%2Bm=72
2m=72
highlight%28m=36%29