### The average weight of a group of 75 girls was calculated as 47 kgs. It was later discovered that the weight of one of the girls was read as 45 kgs. Whereas her actual weight was 25 kgs. What is the actual average weight of the group of 75 girls? ( Rounded off to two digits after decimal).

A. 34 B. 36 C. 30 D. None of these Answer: Option D

### Solution(By Apex Team)

Average weight of 75 girls = 47 kgs Total weight of 75 girls = 47 × 75 = 3525 kgs Actual weight of 75 girls = x Correct weight of 75 girls = 3525 – 45 + 25 = 3525 – 20 = 3505 kgs ∴ Required average weight x $\Large=\frac{3505}{75}$ x = 46.73 kgs

A. 20
B. 21
C. 28
D. 32

A. 18
B. 20
C. 24
D. 30

A. 10 years
B. 10.5 years
C. 11 years
D. 12 years