Question

12. Find the cost of painting the total outside surface area of solid cylinder 20 min height and 50 cm in diameter at 10.50 per 100 sq.m. 13. A cylindrical tank has a capacity of 6160 cu.m. Find its depth, if the diameter of the base is 28 m. Also, calculate the cost of painting its inside 22 Use t = 7 2 3 per curved surface at the rate of 2.80 per sq.m 14. A solid cylinder has a total surface area of 231 cm². Its curved surface is of the total surface area. Find the volume of the cylinder. 15. Find the cost of digging a well 280 m deep having diameter 3 m at the rate of 3.60 per m. Find also the cost of cementing its inner curved surface at 1.25 m2 6. The cost of painting the total outside surface closed cylindrical oil tank at 25 paise per square decimetre is 77. The height of the tank is three times the radius of the base of the tank. Find its volume. 7. A powder tin has a square base with the side 8 cm and height 13 cm. Another is cylindrical with the radius of its base 7 cm and its height 15 cm. Find the difference in their capacities. A 20 m deep well with diameter 14 m is dug up the earth from the digging is spread evenly to form a platform 22 m x 14 m. Determine the height of platform 10:​

Answer 1

Step-by-step explanation:

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Answer 2

Answer:

2×22÷7× 25÷20

=7.85714285714