Problem 18 on test 4.1,2,3,4,5 By: H. Whitehead in Mr. Kirkland's Math 111 Class The Problem Step 1. Johnson twins were born 9 years after their older sister. Step 2. Step 3. This year, the product of the sibling's ages are exactly 1055 move than the sum of their ages. The twins are 8 years old.