Question

Four years ago, average of the ages of Pinki, Rinki and Tinki was 26 years. Average of the present ages of Rinki and Tinki is 28 years. Present age of Pinki is what percent of the present average age of all of them.​

Answer 1

Solution :

We know that there are three people (Pinki, Rinki and Tinki)

4 years ago,

• Average age of 3 members = 26 yrs

• Sum of ages of 3 members = 26 × 3 = 78 yrs.

⟹ Average age 4 yrs ago = 78 + (4 yrs × 3 members)

⟹ 78 + (4 × 3)

⟹ 78 + 12

⟹ 90 years.

Present Average age,

• Sum of Present age of both = 2 × 28 yrs = 56 yrs

• Ages of 3 members = 90 / 3 = 30 years

Average Age :

⟹ Average age 4 ago - Sum of present age of both

⟹ 90 - 56

⟹ 34 yrs

Percent of the present average ages :

⟹ Average age / Ages of 3 members × 100

⟹ 34 / 30 × 100

⟹ 113.33 %

• ∴ The percent of the present average ages is 113.33 %