A boy is now twice as old as his sister, four years ago, he was thrice as old as her what are their ages now?
18, 9
14, 7
16, 8
12, 6
Explanation:
The Boy's age = A
The Sister's age = B
A boy is now twice as old as his sister A=2B
Four years ago, he was thrice as old as her
(A-4) = 3(B-4)
apply A = 2B
2B-4 = 3B-12
3B-2B = 12-4
B=8
A= 2B
A=2(8)
A=16
Boy's age=16 years
Sister's age=8 years
The Boy's age = A
The Sister's age = B
A boy is now twice as old as his sister A=2B
Four years ago, he was thrice as old as her
(A-4) = 3(B-4)
apply A = 2B
2B-4 = 3B-12
3B-2B = 12-4
B=8
A= 2B
A=2(8)
A=16
Boy's age=16 years
Sister's age=8 years