harold is a twice as old as jack, who is three years older than Dan. If Harold's age is five times Dan's age, how old in years is jack?

Answer

1 7/8 years or 1.875 years

Explanation

Let Jack's age be x years.

Then;

Harold = 2x years

Dan = 2x - 3

But Harolds age is thre times Dan's age.

∴ 2x = 5 (2x - 3)

2x = 10x - 15

2x - 10x = - 15

-8x = - 15

8x = 15

x = 15/8

= 1 7/8 years or 1.875 years

Jack is 5 years old, WOW!