Question

the age of two sisteris7:6 if elder sister is 15 year 9month old what is age of younger sister

Answer 1

Let the age of elder sister be 7x
Age of younger sister = 6x

According to question
$7x = 15 \frac{3}{4}$
7x = 63/4
x = 9/4

Age of younger sister = 6*9/4
= 54/4
= 27/2
= 13 years 6 months

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Answer 2

let their ages be x.
7x+6x=15+6x(approximately)
7x=15
x=15/7
6x=6*15/7=70/7=10
therefore younger sister is approximately 10 years old.