A pie chart represents a school's timetable for a 360-minute school day. The school decides to increase English time by 20 minutes, taking those 20 minutes from Mathematics. What will be the new sector angle for Mathematics in the updated pie chart?
Show Worked Solution
Worked Solution
Step 1: Understand the scale — the total school day is 360 minutes and the full pie chart is 360°, so 1 minute = 1 degree.
Step 2: Current Mathematics time.
Mathematics sector = 80° → 80 minutes
Step 3: After the change, Mathematics time.
80 − 20 = 60 minutes
Step 4: Convert back to degrees.
60 minutes × (360° ÷ 360 minutes) = 60°
The new Mathematics sector angle is 60°.
Correct answer: 60°
Want more questions like this? Superholic Lab has 10,000+ MOE-aligned questions with full worked solutions.
Start Free Trial — 7 Days Free