The answer would be 69! One easy way to figure this out would be to figure out the difference between each number which would be 3, and subtract that from the starting number which would be 12. 12-3=9. Now turn it into an equation, since the pattern is going by 3’s we will multiply 3 20 times. 3 x 20=60 and then add 9 which is the difference between 12 and 3. 3x20+9=69, or you can do it the way i have attached.