Question

Coach Johnson is 10 years older than Tim. When Tim started football 3 years ago, Coach Johnson was twice his age. How old is Tim now?

Answer 1

j = t + 10
t - 3 = 2j
solve for j

Answer 2

oops
j - 3 = 2t

Answer 3

oops again
j-3 = 2(t-3)

Answer 4

I'll try to be clearer without providing the exact answer.
We need to convert the words to equations.
Let j = Coach Johnson's current age.
Let t = Tim's current age.
The first statement says that j = t + 10.
The second statement says that j-3 = 2(t-3)
Solve by substitution. Substitute t + 10 for j in the second equation.
t + 10 - 3 = 2(t - 3)
Now solve for t.