Question 181
The average weight of 21 girls was recorded as 58 kgs. If the teacher’s weight was added, the average increased by one. What was the teacher’s weight ?
Solution
The average weight of 21 girls was recorded as 58 kgs
Hence sum of the weight of the girls = $$ 21\times 58$$
If the teacher’s weight was added, the average increased by one.
Hence sum of the weight of the girls and the teacher = $$ 22\times 59$$
Hence weight of the teacher =( $$ 22\times 59$$) - ($$ 21\times 58$$) = 80kg
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