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?

Answer: 15
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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