The cross-section of a lake is a trapezium in shape. If the lake is 20m wide at the top and 5m wide at the bottom and the area of cross-section is 600 sq m, the depth of lake is?	Choose the correct choice from the following choices:
A) 48 m
B) 68 m
C) 46 m
D) 84 m
E) 97 m
1/2 * d (20+5) = 600   d = 48   48 mNSWER:48 m
<result>A</result>
The cross-section of a lake is a trapezium in shape. If the lake is 20m wide at the top and 5m wide at the bottom and the area of cross-section is 600 sq m, the depth of lake is?