Correct Answer - Option 3 : 42 years

**Given:**

The ratio of the ages of Khushi and her Aunt = 1 : 4

The ratio of the ages of Khushi’s Aunt and her brother = 9 : 1

Khushi’s brother = 5 years younger than Khushi

**Calculation:**

Khushi : her Aunt = 1 : 4

Her Aunt : Her brother = 9 : 1

∴ Khushi : Her Aunt : Her brother = 9 : 36 : 4

∴ According to the question,

⇒ 9x – 4x = 5

⇒ 5x = 5

⇒ x = 1

Khushi’s Aunt’s age after 6 years = (36 × 1) + 6

⇒ 42 years

**∴ Khushi’s Aunt’s age after 6 years is 42 years.**