Speed of boat is 20 km/hr. Speed of the stream is 15% less than speed of boat. Then find time taken by boat to go 74 km downstream?
Speed of stream = 20 × (85/100) = 17 km/hr Time taken to go 74 km = 74/(20 + 17) = 2 hrs
What is the average of all the prime numbers which are less than 35?
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The sum of four consecutive counting numbers is 154. Find the smallest number?
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Find the value of 6 + 66 + 666 + 6666 +hellip;hellip;hellip;hellip;.. + n terms.
1. `(2)/(3) ((10 xx (10^(n)- 1))/9 - n)`
2.
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