Question

The average age of 3 girls is 20 years and their ages are in the ratio 3:5:7. Find the age of eldest girl.​

Answer 1

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Answer 2

Step-by-step explanation:

Total age of e girls = 3× 20

= 60 years.

let the ages of girls be x

3x + 5x + 7x = 60

15x = 60

x = 4

3x = 3×4 = 12 years.

5x = 5×4 = 20 years.

7x = 7×4 = 28 years.