Question

fram the simultaneous equation write only two equation 5 years ago the ratio of the ages of pranav and his sister was 3:1 two years hence it will be 5:4​

Answer 1

Step-by-step explanation:let, the present age of pranav be x years the present age of his sister is y years.

5 years ago,

pranav age was(x-5) yearsand

his sister age was (y-5) years

a/c to condition

1(x-5):(y-5)=3:1

by cross multiplication,

(x-5)×1=(y-5)×3

x-5=3y-15

x-3y=-15+5

x-3y=-10......................1

2 years hence,

pranav age will (x+2) years

and his sister age will (y+2) years

a/c to condition 2

(x+2): (Y+2)=5:4

by cross multiplication,

(x+2)X4=(Y+2)X5

4x+8=5y+10

4x-5y=10-8

4x-5y=2.........................2

two simultaneous equation is formed.