Najma is 6 years older than her younger sister. After 10 years, the sum of their ages will be 50 years. How do you find their present ages?

All Of The Above

Let's have R be Najma's age.

And we have a younger sister who is 6 years younger than Najma:

R−6

In 10 years, the sum of their ages will be 50. So in 10 years Najma will be:

R+10

and her sister will be

R−6+10

and the two added together will be 50:

(R+10)+(R−6+10)=50

How old are they now?

(R+10)+(R−6+10)=50

2R+14=50

2R=36

R=18

and her sister is

R−6=18−6=12