Mary has $750.00 in 10 and 25 dollar coins. If she has twice as many 10 dollar coins as 25 dollar coins. What's the number of 10 dollar coins she has?
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x = number of $10 coins y = number of $25 coins Mary has $750.00 in 10 and 25 dollar coins 10x + 25y = 750 she has twice as many 10 dollar coins as 25 dollar coins 2y = x solve the system of equations using a method you were taught.
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