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Find the one which does not belong to that group ?

Find the one which does not belong to that group ?
A. 16
B. 28
C. 36
D. 64
E. 4

 Answer: Option C
Explanation:
16, 36, 64 and 4 are perfect squares but not 28.
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It takes 10 days for digging a trench of 100 m long, 50 m broad and 10 m deep. What length of trench, 25 m broad and 15 m deep can be dug in 30 days ?

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