The average age of four members of a family is 32 years. If the age of a guest is included, then the average age increases by 12.5%. What is the age (in years) of the guest ?
Answer : Option B
Explanation : Average age of 5 members of family
years
∴ Guest’s age = 36 × 5 – 32 × 4
= 180 – 128 = 52 years
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