The average height of 60 students in a class is 150 cm, out of which 40 students had an average height of 180 cm. The average height of the remaining 20 students is _____ cm.
- 90
- 80
- 70
- None of these
Explanation
Total height of 60 = 150 × 60 = 9000 cm
Total height of 40 = 180 × 40 = 7200 cm
Total height of 20 = 9000 - 7200 = 1800 cm
Average of 20 = 1800/20 = 90 cm
Last verified on 07-03-2026
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