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3rd grade

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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?

  • 3rd grade -

    Let's let D = dimes.

    D + 70 = 150
    D = 150 - 70
    D = 80

  • uwodc mdek -

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