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Luis and Julia have the same number of coins. Luis has only dimes and Julia has only quarters. If Julia has $1.80 more than Luis does, how many coins does each have?
Let the number of coins each has be "x".
Value of Luis's dimes = 10x cents
Value of Julia's quarters = 25x cents
Julia value - Luis value = 180 cents
x = 12 (number of coins each has)