Question 918223
{{{Q+N=106}}}
{{{0.25Q+0.05N=13.70}}}
Multiply eq. 1 by 0.25 and then subtract eq. 2 from it,
{{{0.25Q+0.25N-0.25Q-0.05N=26.5-13.7}}}
{{{0.2N=12.8}}}
{{{N=64}}}
Then,
{{{Q+64=106}}}
{{{Q=42}}}
42 quarters and 64 nickels