Question

If the sister is three times older than her brother.Five years earlier five timesas old as her brother. What is the present age of the sister?

Answer 1

Hiii. Hope it helps.
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Let the brother's age be x
sister's age = 3x
5 years ago
_________
Brother's age= x-5
Sister's age= 3x-5

ATQ
3x-5=5(x-5)
3x-5=5x-25
-5+25=5x-3x
20=2x
x=20÷2
x=10

Brother's age=x=10
Sister's age= 3x= 3×10= 30

Thus, sister's age is 30 years..

Answer 2

Let brothers age be = x
Then sisters age = 3x
Five years before
Broher = x-5
Sister = 3x-5
As per question five years before sister was ×5 times of brothers age

So,

3x-5=5(x-5)
3x-5=5x-25
3x-5x= -25+5
-2x=-20
- and - wil cancel
So
2x=20
X=20÷2
X=10
Brother =x = 10
Sister = 3x = 3×10=30

So the present age of sister is 30

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Please bro