james had 20 marbles more than kevin. after kevin lost 10 marbles, james had thrice as many marbles as kevin. how many marbles did james have at first?
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Answer:
25
Step-by-step explanation:
You started with 45 marbles.
Thought process:
Let x = # of marbles friend has
Thus, x+20 = 3(x-10)
x+20 = 3x - 30
50 = 2x
x = 25
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