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Lisa and Marco have a total of $85. Lisa has $15 less than Marco. How many dollars does Marco have?

Lisa and Marco have a total of $85. Lisa has $15 less than Marco. How many dollars does Marco have?
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1 Answer

L = M - 15
L + M = 85
 
Using substitution,
M - 15 + M = 85
2M - 15 = 85
 
Solve for M