B Nirmala Shastry Solutions for Exercise 4: EXERCISE 12.4

 After $22$ years, Avni will be thrice her present age. Find Avni's present age.
 

The difference between the ages of a man and his daughter is $26$ years and the sum of their ages $74$ years. Find the daughter's age.
 

The difference between two numbers is $15$ and the sum of the two numbers is $61$. Find the numbers.
 

A father's age is $4$ times his daughter's age. The sum of their ages is $60$ years. Find their present ages.

Ravi's father is $5$ years more than thrice Ravi's age. The sum of their ages is $61$ years. Find their ages.

The sum of $3$ consecutive numbers is $213$. Find the numbers.

The number of girls in a school is $94$ more than the number of boys. If the number of students in the school is $1064$, find the number of boys in the school.

The length of a rectangle is thrice its width. If its perimeter is $32 \mathrm{cm}$, find its length (in $\mathrm{cm}$).