Problem: A triangle and a trapezoid are equal in area. They also have the same altitude. If the base of the triangle is 18 inches, the median of the trapezoid is
Answer Choices:
A. 36 inches
B. 9 inches
C. 18 inches
D. not enough information
E. none of these answers
Solution:
A=21​bh=21​h(b1​+b2​);∴b1​+b2​=b=18
∴m=21​(b1​+b2​)=9