A student scored 72, 81, 69 and 78 in four tests. What score must she get in the fifth test to have an average of 75?
- A.70
- B.72
- C.75 ✓
- D.78
Explanation: Sum needed = 5×75 = 375. Current sum = 300. Fifth score = 75.
Class 6 IMO Mathematics Olympiad practice · Arithmetic · Multi-step Word Problems
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