Question

Average age of three girls is 20years and their age are in ratio 3:5:7 find the age of the smallest girl

Answer 1

Answer:

ATQ,

(3x+5x+7x)/3=20

15x=60

x=4

3x=12

x=4

the age of the smallest girl=4 year

Answer 2

The age of the smallest girl is 12 years

Step-by-step explanation:

The ratio of age of three girls = 3:5:7

Smallest girl age = 3x

Median age = 5x

Elder age = 7x

Average of all three age is 20

$\dfrac{3x+5x+7x}{3}=20$

$15x=60$

$x=4$

Age of smallest girl = 4 x 3 = 12 years

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