In a room, all except 18 of the people are over 50 years of age. 15 of the people in the room are under 50 years of age. If 10% of the people are at the age of 50 years, how many people are in the room>

In a room, all except 18 of the people are over 50 years of age. 15 of the people in the room are under 50 years of age. If 10% of the people are at the age of 50 years, how many people are in the room> Correct Answer 30

let, Total number of people = x 50 years of age = x - 18 Under 15 years of age = 15 0.10x = x - x + 18 - 15 ∴x = 30 ans: 30
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