1. The mean age of 10 students of a class os 15 years. A student of age 14 years leaves the class in his place age of their teaches is counted. This increased the mean age of group to 16 years.
2. A heap of wheat is in the form of right circular cone whose base diameter is 10.5m and of height 3m. Find the volume of the wheat in it. If the heap is to be covered by the canvas to protect it from rain, find the area of canvas required.
Plzz explain it in detail.
Answers
Answered by
0
Answer:
Step-by-step explanation:
1.Total of ages of 10 students=10*15=150
Let age of teacher =x
then (150-14+x)/10=16
136+x=160,x=160-136=24
Hence age of teacher=24 yrs
====================================
2. r=5.25 m h=3 m
L^2=r^2+h^2
L=[(5.25)^2+9]^1/2
=(36.5625)^1/2 = 6.04 m
Volume of wheat=πr²h
=22/7*5.25*5.25*3
=259.875 m3
SA of heap = πrL=22/7*3*6.04=66*6.04/7
=56.948 m2
So area of canvas =56.948 m2
Similar questions