The average age of three people is 25. If their ages are in the ratio 3:5:7, what is the lowest age among them?
- 5
- 10
- 15
- 20
Explanation
We are given:
-
Average age of 3 people = 25
-
So, total age = 25 × 3 = 75
Their ages are in the ratio 3:5:7, which means:
Let their ages be 3x, 5x, and 7x
-
Total = 3x + 5x + 7x = 15x
Set 15x = 75
⇒ x = 5
So, the ages are:
-
3x = 15
-
5x = 25
-
7x = 35
The lowest age is 15
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