Let the speed of the boy in still water be x kmph. Then, (x + 5) × 3 = (x – 5) × 8 => 3x + 15 = 8x - 40 => 5x = 55 => x = 11 kmph
The denominator of a rational number is 4 more than its numerator. If the numerator is increased by 5 and the denominator is decreased by 3, we obtain 3...
What is the average of first 39 multiples of 3.9?
The ratio of two natural numbers 'u' and 'v' is 3:4, respectively. When 12 is added to 'u' and 8 is subtracted from 'v', the ratio of 'u' to 'v' becomes...
One-seventh of a 2-digit number is 10 less than half of the number. What is the sum of the digits of the 2-digit number?
If the expression (px3 + x2 - 2x - q) is divisible by (x-1) and (x + 1), what are the values of
p and q respectively ?
Sum of squares of three consecutive numbers is 677. Find the sum of first and third number.
What is the remainder when 26×28×32 is divided by 25?
Two friends, P and Q, each have the same amount saved. Q manages to save one-fourth of his income, while P saves one-third of his. Given that P spends R...
A monkey climbs a tower of height 60 m. It climbs 5m above in 1st minute and 4m below in 2nd minute. In how many minutes monkey wi...
