Question
A man can row one quarters of a kilometer against the
stream in 30/4 minutes and return in 5/2 minutes. The speed of the man in still water is:Solution
Distance covered upstream in 30/4 minutes = 1/4 Km Distance covered upstream in 1 hour = 1/4× 4/30× 60 = 2 km/hr Distance covered downstream in 5/2 minutes = 1/4 km Distance covered downstream in 1 hour = 1/4 × 2/5× 60 = 6 km/hr Speed of the man in still water = 1/2(2 + 6) = 4 km/hr
A two-digit number when divided by the sum of its digits gives quotient 5 and remainder 2. If the digits differ by 1, find the number.
Let ‘x’ be the least number divisible by 9, 12, 16, 18 and 20, and also ‘x’ is a perfect square. Find the remainder when ‘x’ is divided by 9...
- Find the remainder if
Five times a positive integer is 3 less than twice its square. Find the integer.
- If 85% of a number is added to itself, the result exceeds the original number by 51. Find the final number obtained.
There is a fraction whose denominator is 5 more than its numerator. If the numerator is increased by 10 and denominator is decreased by 4, the fraction ...
Out of four numbers, the average of the first three is 16 and that of the last three is 14. If the last number is 17, then find the first number?
Sum of all positive integers from 1 to 100 is
Find the remainder obtained when 34 × 46 × 52 is divided by 25.
A number is first increased by 20% and then decreased by 10%. If the final number is 108, find the original number.
