Question 514067
<pre>
In a bag there are some dimes and quarters - 

12 coins in all. 

d + q = 12


 There are three times as many quarters as dimes. 

q = 3d


So we have this system of two equationa in two unknowns:

d + q = 12
q = 3d

Solve that system and get d = 3, q = 9, 3 dimes and 9 quarters



The dimes are worth three times as much as the quarters.
b. how could the dimes be worth three times as much as the quarters?

Because they are probably 3 pure silver dimes dated before 1964.

Edwin</pre>