Class 6 · Olympiad Prep

The average of 12, 17, 19, 22 and x is 18. Find x.

A.18
B.20 ✓
C.22
D.24

Explanation: Sum needed = 5×18 = 90. Known sum = 12+17+19+22 = 70. x = 90−70 = 20.

Class 6 IMO Mathematics Olympiad practice · Arithmetic · Multi-step Word Problems

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