Question

The ages of A and B are of the ratio 2:5.
5 years ago they were in the ratio of 1:10. Find the age of B?

Answer 1

A/B = 2/5 ---> A = 2B/5 ... (1)
(A-5)/(B-5) = 1/10 ... (2)
subtitute the 1st equation into 2nd equation then solve for B

Answer 2

dont get it

Answer 3

(A-5)/(B-5) = 1/10
now change A = 2B/5 to get
(2B/5 - 5)/(B - 5) = 1/10
cross multiplication!
10 * (2B/5 - 5) = B - 5
10 * 2B/5 - 10 * 5 = B - 5
4B - 50 = B - 5
now can solve for B ?

Answer 4

*can you

Answer 5

i dont understand the way you have written it.

Answer 6

which parts you still dont get it ?

Answer 7

can I?

Answer 8

yep

Answer 9

sure :)

Answer 10

let say 5years ago, age of A is x
age of B is 10x
does it make sense?

Answer 11

now, it means after 5 years, age of A is x +5
age of B is 10x +5
got this part?