Algebra II
posted by Emily on .
Find the solution if possible. If there is not enough information to solve the problem or if it has no solution, say so. If extra information is given, identify it.
14. A collection of 30 coins worth $5.50 consists of nickels, dimes, and quarters. There are twice as many dimes as nickels. How many quarters are there?

I'm pretty sure there's enough information to solve this problem, I just can't figure it out. I either get fractions or negative numbers as my answer. Any help is greatly appreciated!! :)

Q+D+N=30
.25Q+.10D +.05N=5.50
D=2N
Yes, three equations, three unknowns, enought information. 
Ah, ok you made everything a lot simpler. Thanks!! :)

A collection of 30 coins worth $5.50 consists of nickels, dimes, and quarters. There are twice as many dimes as nickels. How many quarters are there?