Let Q be # of quarters.

Then the number of dimes is 3Q, the number of nickels is (3Q-5).

Your "value" equation is

5*(3Q-5) + 10*(3Q) + 25Q = 395.   Or

15Q - 25 + 30Q + 25Q = 395.

Can you complete the solution from this point ?

Your equations are incorrect!

Let the number of quarters be Q

Then number of dimes = 3Q

Number of nickels = 3Q - 5

We then get: .25Q + .1(3Q) + .05(3Q - 5) = 3.95

.25Q + .3Q + .15Q - .25 = 3.95

.7Q = 3.95 + .25

.7Q = 4.2

Q, or number of quarters = 

Number of dimes: 

Number of nickels:  

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