Question

Khairul's aunt is 4 times as old as he is. In 8 years' time, his aunt will be 2 and a half
times as old as he is. Find his aunt’s present age

Answer 1

Answer:

I'm assuming that you're in algebra; my method goes like this.

a=4n

a=5/2n+8

where a is the aunt's age and n is the nephew's.

Now, since a=a, set the equations equal. (I replaced 5/2 with 2.5, my preference)

4n=2.5n+8

Then reduce

2.5n=8

n=8/2.5

n=3.2

then solve for a

a=4n

a=4(3.2)

a=12.8