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A certain sum lent out at simple interest doubles itself in 20 years. Number of years in which this sum trebles itself at the same rate of interest is

A certain sum lent out at simple interest doubles itself in 20 years. Number of years in which this sum trebles itself at the same rate of interest is
a. 30
b. 40 - ans
c. 25
d. 20
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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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