Mathematics
NULL
Medium
Question
Eleven numbers average 10.9. The first six average 10.5 and the last six average 11.4. Find the sixth number.
A
11
B
11.3
C
11.4
D
11.5
✓ Official correct answer
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A
11
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B
11.3
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C
11.4
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D
11.5
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Explanation
Sixth = 63 + 68.4 − 119.9 = 11.5.