Q. The average age of 14 girls and their teacher's age is 15 yr. If teacher's age is excluded, then the average reduced by 1. What is the teacher's age? [SSC CGL 2013].
EXPLANATION
Sum of 14 girl's and teacher's age = 15x 15 = 225
Without teacer's age, sum of 14 girl's age = 14 X14 = 196
∴ Teacher's age = 225 - 196 = 29 year
Q. The average weight of 21 boys was recorded as 64 kg. If the weight of the 'teacher was added,...
Friday, 22 May 2020
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