Question

Kalyani is 4 years younger than Reshma. If Reshma’s age is ‘y’ years, find:

a. Kalyani’s age in terms of Reshma’s age .

b. Kalyani’s age after 7 years.

c. Kalyani’s age 4 years ago.​

Answer 1

Explanation:

(a):- Given,

Reshma's age = y years

Since, Kalyani is 4 years younger than Reshma

Therefore, Kalyani's age will be = Reshma's age - 4 yrs

= y - 4 yrs

Thus, Kalyani's age interns of Reshma's age is y - 4yrs

(b):- Now WKT,

Kalyani's age = y - 4 yrs

A/Q,

Kalyani's age after 7 yrs = (y-4)+7

= (y - 4) +4 +3

= y+3yrs. [ since, (-4),(+4) cancelled)

(c):- Now WKT,

Kalyani's current age = y+3 years

So, A/Q

Her age 4 yrs ago = (y + 3) - 4yrs

= y+3-4yr

= y-1yrs

Hence, Kalyani was y-1 year old, 4 years ago