Question 540672
Let quarters be =q

Dimes = 2q

Nickels = 2q+5

$3 = 300 cents

25q+10*2q+5(2q+5)=300

25q+20q+10q+25=300
55q+25=300
55q+25-25=300-25
55q=275
q=275/55
q=5=> number of quarters
Dimes = 2*q= 10 
Nickesls = 2q+5 = 15