SOLUTION: I need this by 6:00am! 20 coins, $2.30 you have to find how many coins is in the 20 coins. There are only quarters dimes and nickels. Nickels is twice of the quarters!

Question 892277: I need this by 6:00am!
20 coins, $2.30 you have to find how many coins is in the 20 coins. There are only quarters dimes and nickels. Nickels is twice of the quarters!
Answer by josgarithmetic(39620) (Show Source): You can put this solution on YOUR website!
(Earlier posted solution was wrong. Now CORRECTED here):

SOLUTION NOW CORRECT:

n,d,q for nickels, dimes, quarters.

Coin count:

Money count:

Given n,q relationship:

Use n to eliminate n in the money and coin count equations.
and
Revise system:

Multiply coin counts by 2 as preparation to eliminate d.

SUBTRACT:

-----The solution for q quarters.

From that q,

------solution for n nickels.

Now using coin count, or by difference, d+12+6=20
-------solution for d dimes.

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