The first four multiples of 7 are 7, 14, 21 and 28. What is their average?
- A.14
- B.16
- C.17.5 ✓
- D.21
Explanation: (7+14+21+28) ÷ 4 = 70 ÷ 4 = 17.5.
Class 6 IMO Mathematics Olympiad practice · Arithmetic · Multi-step Word Problems
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