MCQOPTIONS
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				| 1. | 
                                    The cross-section of a cannel is a trapezium in shape. If the cannel is 10 m wide at the top and 6 m wide at the bottom and the area of cross-section is 640 sq m, the depth of cannel is_________? | 
                            
| A. | 20 m | 
| B. | 60 m | 
| C. | 40 m | 
| D. | 80 m | 
| Answer» E. | |