Question

Omar is 66 years old and Emily is 20 years old.

How many years will it take until Omar is only 3 times as old as Emily?

Answer 1

3

20+3=23
66+3=69
23*3=69

Answer 2

This problem can be solved with an equation or by trial and error.
20 is just a little less than a third of 66, so it won't be many years until Omar is only 3 times as old as Emily.

Just write a table. Start with their ages now. In each line, add one year to their ages until Omar's age is 3 times Emily's age.

I started the table for you below.
Just keep adding lines.