how do find the equation to this problem...?

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how do find the equation to this problem...?

The man discovered some quarters and nickels in an old chest. There were 70 coins all together. Their value was $4.50. Find out how many of each coin where in the chest.

2007-01-30 15:35:45 · 3 answers · asked by Nicole H 1 in Science & Mathematics ➔ Mathematics

3 answers

n + q = 70
.05n + .25q = 4.50

n + q = 70
5n + 25q = 450

n + q = 70
n + 5q = 90

Multiply top by -1

-n - q = -70
n + 5q = 90

4q = 20
q = 5

n + 5 = 70
n = 65

ANS :
65 nickles
5 quarters

2007-01-30 15:42:24 · answer #1 · answered by Sherman81 6 · 0⤊ 0⤋

x+y = 70

How much is a nickel worth? I'm Australian.

25x + (value of nickel in cents)*y = 450

2007-01-30 23:40:55 · answer #2 · answered by Hy 7 · 0⤊ 0⤋

65 nickles and 5 quarters

2007-01-30 23:43:23 · answer #3 · answered by Steven M 3 · 0⤊ 1⤋