Task: Question Answering
Input (English): Problem: the cross section of a canal is trapezium in shape. the canal is 12 m wide at the top and 8 m wide at the bottom. if the area of the cross section is 840 sq. m, the depth of the canal is :
Options: a. 42 m, b. 84 m, c. 63 m, d. 8.75 m, e. 9.75 m
Output (English): b