Jody is 56 years old and has 3 grandchildren - Trent, Kennedy and Leslee.



Trent is twice as old as Kennedy, who is 4 years younger than Leslee.



The grandchildren's ages added together are half of Jody's age.

How old is Trent?

Trent is 12.

Step-by-step explanation:

T =  2K      (Trent is twice as old as Kennedy)

K =  L - 4   (Kennedy is 4 years younger than Leslee)

2 (L - 4)   +     L - 4        +         L         =    28

   Tom        Kennedy         Leslee

2L - 8  + L + 4 + L   =  28

4L  =  28 - 8 - 4

4L = 40

L    = 10   (Leslee is 10)

Plug in L into Trent's age):

2 (L - 4)

2 (10 - 4)

2 (6)

12   (Trent's age)

And, of course, Kennedy must be 6 because 28 - 10 - 12 = 6