SAT Math Solved: $50 Fixed + $30x = $140 | How Many Labour Hours? | Linear Equation Trick)?

A phone repair shop charges a fixed diagnostic fee of $50 plus $30 for each hour of labour. Total cost $140. How many hours of labor did the repair take? In this video Maths Doctor explains:✅ Fixed charge vs Variable charge✅ How to form equation 50 + 30x = 140✅ 10 sec trick to solve - SAT Heart of Algebra Solution: 50 + 30x = 140 30x = 90 x = 3 hours - Option B correct. This type of Linear Equation (Fixed + Variable) comes EVERY YEAR in SAT Digital. Follow for daily SAT Math #maths #linearequation #mathsdoctor #viralmaths #mathtrick #algebra #mathspuzzle