Problem
41. Liam and Jackson both play basketball. Three times the sum of their jersey numbers is 90 . If Liam's number is 7 , what is Jackson's number?
Solution
Step 1 ：Let x be Jackson's jersey number. The equation is: 3(Liam's number + Jackson's number) = 90
Step 2 ：Replace Liam's number with 7: 3(7 + x) = 90
Step 3 ：Solve for x: x = \( \frac{90 - 3(7)}{3} = 23 \)
