An earthquake of magnitude 6 on Richter scale has ______________ times more destructive energy than an earthquake of magnitude 4.
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If after giving a discount of 18%, a book is sold for Rs 1599, then what will be the marked price (in Rs) of the book?
If 20 men working 8 hours per day can complete a piece of work in 21 days. How many hours per day must 48 men work to complete the same job in 7 days?
A and B together can do a piece of work in 12 days while A alone can do the same work in 30 days. B alone can do it in
Who invented radar?
Who invented the vacuum pump?
Who discovered Antarctica?
Amir Khusrow was the disciple of whom?