Question 374891
Let L be the number of large frames, S the number of small frames.
1.{{{L+S=22}}}
2.{{{15L+8S=239}}}
Multiply eq. 1 by -8 and add to eq. 2,
{{{-8L-8S+15L+8S=-176+239}}}
{{{7L=63}}}
{{{highlight(L=9)}}}
Then from eq. 1,
{{{9+S=22}}}
{{{highlight(S=13)}}}