Thursday

August 28, 2014

August 28, 2014

Posted by **Adam** on Wednesday, November 9, 2011 at 6:25am.

- Mathematics -
**Reiny**, Wednesday, November 9, 2011 at 9:41amLet John's present age be x

Four years ago John was x-4

Half of John's age 4 years ago = (x-4)/2

John's age in 5 years from now = x+5

a third of his age 5 from now = (x+5)/3

(x-4)/2 = (x+5)/3

cross-multiply

3x - 12 = 2x + 10

x = 22

So John is now 22 years old

check:

4 years ago he would have been 18

5 years from now he will be 27

is half of 18 equal to a third of 27 ? YES

**Related Questions**

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 ...

Math - Loretta's age now is twice John's age five years ago. In three years the ...

math - A. A woman was 30 years old when her daughter was born.Her age is now 6 ...

math - 1. Lisa is 15 years old and her father is 40. How many years ago was the ...

Algebra - One half of Heather's age two years from now plus one third of her age...

word problems - John is 12 years old. a) Write an expression for John's age x ...

maths - John is 3 times as old as Susan now. In 4 years time John will be 18 ...

Math - One-third of Derick's age two years ago is equal to a quarter of his age ...

math - john is the age that sally was 3 years ago,13 year old elissa is 3 years ...