Question

M. The length, breadth and height of a rectangular solid are in the ratio 54:2. If its total
surface area is 1216 cm?, find the volume of the solid.
127Three cubes of silver with edges 3 cm, 4 cm and 5 cm are melted and recast into a single
cube. Find the cost of coating the surface of the new cube with gold at the rate of 3.50 per
square cm.
ja A car has a petrol tank 40 cm long, 28 cm wide and 25 cm deep. If the full consumption of
the car averages 13.5 km per litre, how far can the car travel with a full tank of petrol?
JA The diameter of a garden roller is 14 m and it is 2 m long. How much area it will cover in
5 revolutions?
18. The capacity of an open cylindrical tank is 2079 m and the diameter of its base is 21m.
Find the cost of plastering its inner surface at 40 per square metre.
Jo. A solid right circular cylinder of height 1.21 m and diameter 28 cm is melted and recast
into 7 equal solid cubes. Find the edge of each cube.
in ) How many cubic metres of soil must be dug out to make a well 20 m deep and 2 min
diameter?
(1) If the inner curved surface of the well in part (1) above is to be plastered at the rate of
*50 per m², find the cost of plastering.
​

Answer 1

Length =54

Breath =2

Area =1216

The value of 1is

54+6=60

Then 1216/60=2.2667