Question

Renu's mother is 4 times as old as Renu. After 5 years, her mother will be three times as old as she will be then. What are thuer present ages?

Answer 1

age of renu=x
renus mother =4x
after 5 yrs her mother = 3x
4x-3x=3xX5
3x=15
x= 5

Answer 2

Let the age of Renu's mother is x
Let the age of Renu is y
X=(y)4
X-4Y=0---1
X+5=(y+5)3
X+5=3Y+15
X-3Y-10=0---2
EQUATION 1-2
X-4Y=0
X-3Y-10=0
GIVES :
- 7Y-10=0
-7Y=10
Y=10/-7
Substute in equation 1
X-4y=0
X-4(10/-7)=0
X-40/-7=0
X=40/7