Question

A girl has 8 coins in dimes and quarters. Their value is $1.55. How many quarters does she have?

Answer 1

d+q=8
.10d+.25q=1.55

Answer 2

Diagram method.
1. Draw 8 circles, representing 8 coins
A coin must at least carry a value of 10 cents.
2. Draw 1 leg for 10 cents onto every circle.
Draw the remaining legs until the value reaches $1.55.
(3 legs for a quarter)

Answer 3

d=8-q from the first equation.
Replace d with 8-q in the second equation and solve.

Answer 4

I still like my method better :)

Answer 5

.10(8-q)+.25q=1.55
10(8-q)+25q=155
80-10q+25q=155
15q=75
q=5
d=3

Answer 6

thanks alot

Answer 7

your welcome :)