Question 1098971
{{{5N+10D+25Q=970}}}
{{{N+2D+5Q=194}}}
.
.
{{{N=7+D}}}
{{{D=N-7}}}
.
.
{{{Q=2N}}}
Substituting,
{{{N+2(N-7)+5(2N)=194}}}
{{{N+2N-14+10N=194}}}
{{{13N=208}}}
Solve for N then use the other equations to solve for D and Q.