Asolid is built from three identical cylinders, one rectangular prism and one triangular prism. the cylinders have base radii of 2 m and heights of 5 m, the rectangular prism has base side lengths of 4 m and 5 m, and a height of 10 m, and the triangular prism has base height of 4 m, base length of 5 m and height of 20 m. find the volume of the solid in dm2. (take π = 3.14)
24,840 dm2
31,400 dm2
58,840 dm2
78,840 dm2
number 1 is 30% more than number 3 and number 2 is 40% more than number 3. find the ratio of number 1 to number 2.
3: 4
8: 10
13: 14
14: 17
it takes 8 hours for pump a to fill a tank, and 6 hours for pump b to fill the same tank. if pumps a and b are used together with pump c, the tank can be filled in 2 hours. how long would it take pump c to fill the tank on its own?
3 hours
4.2 hours
4.8 hours
5.4 hours
a factory produces fertiliser at the rate of 4,800 kg/hr. one month, the owner decides to increase its production in the ratio 9: 4. 6 months later, the owner decides to decrease the new production rate in the ratio 4: 5. what proportion of the original production rate is the new production rate?
5: 9
4: 5
4: 9
9: 5