A) 19 yr
B) 19 yr 6 months
C) 20 yr
D) 20 yr 6 months
Correct Answer: B
Solution :
Total age of 20 new students \[=(60\times 18.\text{ }5-40\times 18)\,yr\] \[=(1110-720)\,yr\] = 390 yr \[\therefore \] Their average age \[=\frac{390}{20}=19.5\,yr\] = 19 yr 6 monthYou need to login to perform this action.
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