Answer:
40
Explanation:
The triangle on the right is smaller than the one on the left, so the numbers on the right triangle are smaller. The numbers are being multiplied by 5 because...
side 5 times 5 = side 25 on the left triangle
side 6 times 5 = side 30 on the left triangle
so...
side 8 time 5 = side 40 on the left triangle which is the answer