Question 337911
Let R be the number of rectangles, T triangles.
1.{{{R+T=26}}}
2.{{{4R+3T=92}}}
From eq. 1,
{{{R=26-T}}}
Substitute into eq. 2,
{{{4(26-T)+3T=92}}}
{{{104-4T+3T=92}}}
{{{-T=-8}}}
{{{highlight(T=8)}}}
Then from eq. 1,
{{{R+8=26}}}
{{{highlight(R=18)}}}