3rd grade
posted by Kathy on .
My son has this Math word problem and I can come up with the answer but, I don't know how to explain to him how I got the answer. The problem is:Lauren has collected 150 nickles and dimes. She has 70 more nickles than dimes. How many nickles and how many dimes does she have?

Let's let D = dimes.
D + 70 = 150
D = 150  70
D = 80 
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