500
The Munsons collect nickels, dimes, and quarters in a jar. When they count the change in the jar, there are twice as many nickels as there are quarters. If there is $15.30 in dimes and $74.80 in all, how many quarters are there?
0.05(2q) + 0.25(q) + 15.30 = 74.80 <===> 170 quarters