Question

The average age of a,b and c is 25 years. the ratio of their age is 3:5:7. find the age of a

Answer 1

Hey.

Here is the answer.

Let age of a, b and c be 3x , 5x and 7x receptively .

According to question;

(3x + 5x + 7x )/3 = 25

or, 15x/3 = 25

so, x = 5.

So, age of a is 3x = 3×5= 15 years.

Thanks .

Answer 2

Let ages of a, b, c are 3x, 5x, 7x respectively

Given that average = 25

Average = (3x + 5x + 7x)/3 = 25

15x = 3×25

15x = 75

x = 75/15

x = 5

××××××××××××××××××

Present age of a = 3x = 3(5)=15 years

I hope this will help you

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