Question

11) John is 7 years older than her sister, and the sum of their ages is 21 years. Find their ages​

Answer 1

Answer:

Correct answer -

John = 14

Her sister = 7

Answer 2

Given:

John is 7 years older than his sister, and the sum of their ages is 21 years.

Assumption:

Let the age of his sister be x.

Let the age of John be x + 7.

Solution:

x + x + 7 = 21

or, 2x = 21 - 7

or, x = 14/2

or, x = 7

Answer:

John's Age = x + 7 = 7 + 7 = 14

John's Sister = x = 7

Therefore, John's and his sister's age is 14 and 7 respectively.