Question

The height of a closed cylindrical oil tank is 6 times the radius of the base of the tank . the cost of painting the total outside surface area of the tank at 60 paise per square dm is rs 237.60 . calculate the volume of tank upto two decimal places

Answer 1

Let ,
Height be 6x
Radius be x
now rate is 60paise/metre^2
and price is 23760 paise
so the area is 396 dm^2
Total area of cylinder is
$2\pi \times rh + 2\pi \times r ^{2}$
$2\pi(rh + r^{2} ) \\ 2\pi(6x^{2} + x)^{2} \\ 2\pi(7x^{2}) \\ 2 \times 22 \div 7 \times 7 {x }^{2} \\ 44 {x}^{2}$
and we already have the area
so
$44 {x }^{2} = 396 {dm }^{2} \\ x = 3 \: dm$
RADIUS =3DM
HEIGHT=18DM
NOW FIND THE VOLUME AND YOU WILL GET THE ANSWER AS 509.14 DM
PLEASE select MY ANSWER AS BRAINLEST ANSWER

Answer 2

Answer:

Step-by-step explanation:

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