Posted by **Jordan** on Friday, February 15, 2013 at 4:20am.

The ratio John's age to Ryan's age is 3:1 now . 25 years later , the ratio will become 4:3 .How old is John now ?

- Maths -
**Steve**, Friday, February 15, 2013 at 5:00am
j:r = 3:1, so j=3r

(j+25)/(r+25) = 4/3

(3r+25)/(r+25) = 4/3

3(3r+25) = 4(r+25)

9r+75 = 4r+100

5r = 25

r = 5

so, John is 15

in 25 years, the two will be 40 and 30

## Answer This Question

## Related Questions

- Maths - The ratio John's age to Ryan's age is 3:1 now . 25 years later , the ...
- maths - the ratio of john's age to Mike's age is 7:4. In 10 years time Mike will...
- math - A. John is now 10 years older than Marcus. Three times John's age 5 years...
- math - A. Brad is 12 years older than Sam . If Brad were 8 years older than he ...
- maths - John is 3 times as old as Susan now. In 4 years time John will be 18 ...
- Maths - Robert is three times as old as Catherine now. In 8 years time, the ...
- Math - Loretta's age now is twice John's age five years ago. In three years the ...
- Math - The sum of John's age and twice of his son's age is 56. In 8 years time, ...
- math - one half of what john's age was 4 years ago is equal to on of thrid of ...
- Mathematics - A half of what John's age was 4 years ago is equal to one third of...

More Related Questions