Question
Three numbers are in the ratio 3:5:6. If the sum of
their squares is 630, then the numbers are:Solution
Let the numbers be 3x, 5x and 6x respectively. ⇒ (3x)2 + (5x)2 + (6x)2 = 630 ⇒ 9x2 + 25x2 + 36x2 = 630 ⇒ 70x2 = 630 ⇒ x2 = 9 ⇒ x = 3 ∴ Numbers are 9, 15 and 18.
The efficiency of a woman is 33.33% less than that of a man, whose efficiency is three times that of a child. If 2 children, 3 women, and 4 men together...
24.89² ÷ (34.33 ÷ 20.02) + 67.85 – 89.01 = ?
A sum of Rs.8200 is to be divided among 6 brothers, 5 sisters and 2 aunts. If each sister receives thrice as much as each aunt and each brother receives...
The average of first nine prime numbers isĀ
Select the option that is related to the third number in the same way as the second number is related to the ļ¬rst number.
12 : 60 :: 16 : ?
Which of the following is not a binary number?
If the sum of the digits of a three digit number is subtracted from that number, then it will always be divisible by
(0.04)5 × (0.2)4 ÷ (0.008)2 = (0.2)?
The following chart gives the expenditure incurred by a publisher to bring out a book
The mean deviation of the data 3, 10, 10, 4, 7, 10, 5 is:
