SOLUTION:
In this problem.
Let number of dimes = x, then number of quarters = 2x - 7.
The monetary values of quarters and dimes are;
[tex]\begin{gathered} 0.1x+0.25(2x-7)=6.05 \\ 0.1x+0.5x-1.75=6.05 \\ 0.6x=7.8 \\ x=13 \end{gathered}[/tex]Thus, 2( 13) - 7 = 19.
Therefore, there are 13 dimes and 19 quarters.