Question
The average age of a husband and his wife was 23 years
when they were married 5 years ago. The average age of the husband, the wife and their child is 20 years now. How old is the child now?Solution
Let present ages of husband, wife and child be x, y and z years respectively. Given, ⇒ [(x – 5) + (y – 5)]/ 2 = 23 ⇒ x + y = 46 + 10 = 56 Given, ⇒ (x + y + z)/3 = 20 ⇒ x + y + z = 60 ⇒ 56 + z = 60 ⇒ z = 4 ∴ Child is 4 years old now.
In a mixture 'P', 5 liters of water are replaced with honey, resulting in the mixture containing 55% honey. If the original mixtu...
The mean deviation of the data 3, 10, 10, 4, 7, 10, 5 is:
By which of the following symbol all Excel formula starts?
Simplify: (2x)²-(2y)²-(4x)²
Which of the following shortcut key use to check Spellings in MS Office?
In how many days can ‘Q’ alone complete the work?
I. P, Q and R together can complete the work in 9`(3)/(13)` days.
II. P and ...
Select the correct set of symbols which will fit in the given equation.
5 0 3 5 = 20
The average of first nine prime numbers is
The number of five–digit telephone numbers having at least one of their digits repeated is
Relevant for Exams:
