1. The volume of a cuboid is twice that of a cube. If the dimensions of the cuboid are 9 cm, 8 cm and 6 cm, the total surface area of the cube is:
(1) 72 cm2 (2) 216 cm2 (3) 432 cm2 (4) 108 cm2 (5) None of these
2. The average of marks scored by the students of a class is 68. The average of marks of the girls in the class is 80 and that of boys is 60. What is the percentage of boys in the class?
(1) 40 (2) 60 (3) 65 (4) 70 (5) None of these
3. Out of three numbers, the first is twice the second and is half of the third. If the average of the three numbers is 56, then difference of first and third numbers is:
(1) 12 (2) 20 (3) 24 (4) 48 (5) None of these
4. A boat goes 8 km in one hour along the stream and 2 km in one hour against the stream. The speed (in km/hr) of the stream is:
(1) 2 (2) 3 (3) 4 (4) 5 (5) None of these
5. The price of cooking oil is increased by 25%. By what per cent a family should reduce the consumption of cooking oil so as not to increase the expenditure on this account?
(1) 20 (2) 25 (3) 18 (4) 16 (5) None of these
Answers:
Q A
1. (2)
2. (2)
3. (3)
4. (2)
5. (1)
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