Question 140219
"105 coins consisting of nickels, dimes, and quarters" __ 105=n+d+q


"number of dimes is 5 more than one-third the number of nickels" __ d=5+(n/3) __ 3(d-5)=n


"number of quarters is twice the number of dimes" __ q=2d


substituting __ 105=3(d-5)+d+2d __ 120=6d __ 20=d


substituting __ 3(20-5)=n __ 45=n


substituting __ q=2(20) __ q=40