Question

The average age of three boys is. years and that of four others is (x + 7) years. The average age
of these seven boys is 16 years. Find the value of x.
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Answer 1

Answer:

ANSWER

Let the ages of the three boys be 7x,5x, and 3x.

⇒7x+5x+3x=25×3

⇒15x=75

⇒x=5

Age of youngest boy =3x=3×5=15

Step-by-step explanation:

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Answer 2

Answer:

x=25/2

Step-by-step explanation:

Given:-

average age of three boys= (x) years

average age of four boys= (x+7) years

average age of all seven boys= 16 years

16=[x+(x+7)] /2

16=[2x+7]/2

16×2=2x+7

32=2x+7

2x=25

x=25/2

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