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The average height of 20 girls was recorded as 145 cm. On adding the teacher’s height, it was found that the average increased by 1 cm. The teacher height is
  • a)
    166 cm                     
  • b)
    164 cm
  • c)
    165 cm                     
  • d)
    167 cm
  • e)
    None of these
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
The average height of 20 girls was recorded as 145 cm. On adding the t...
See, sum of all heights of girls is 20*145=2900.Now let the height of teacher be x then (2900+x)/(20+1)=145+1.So on solving the linear equation for x we get answer a)166 cm. So there is correction in the answer .
Community Answer
The average height of 20 girls was recorded as 145 cm. On adding the t...
Height of the teacher = 17*143−16*142
= 2431 - 2272 = 159 Cm
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The average height of 20 girls was recorded as 145 cm. On adding the teacher’s height, it was found that the average increased by 1 cm. The teacher height isa)166 cmb)164 cmc)165 cmd)167 cme)None of theseCorrect answer is option 'C'. Can you explain this answer?
Question Description
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