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Math

Mr.Adams had a coin collection including only nickels, dimes, and quarters He had twice as many dimes as nickels and half as many quarters as he had nickels. If the total face value of his collection was $300.00, how many quarters did the collection contain?

A) 75
B) 100
C) 250
D) 400
E) 800

I got A but it isn't right and I don't know what to do.

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  1. d = 2 n
    q = .5 n

    5 n + 10 d + 25 q = 30,000 cents

    5 n + 20 n + 12.5 n = 30,000

    37.5 n = 30,000

    n = 800
    so
    q = 400
    D

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  2. Thank yoU!

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  3. You are welcome.

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  4. Why aren't we converting the dollars into nickels? It is just converted into cents

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