Question 2374
first define 2 variables, based on what you need to find....

Let t = tom's age now
Let j = jerry's age now.

t=j+4 --eqn 1

9 years ago, tom was (t-9) and jerry was (j-9), so t-9 = 5(j-9)

Now solve these 2 equations. Look at my many previous examples of how to do this.

jon