The average of a collection of 20 measurements was calculated to be 56 cm. But later it was found that a mistake had occurred in one of the measurements which was recorded as 64 cm, but should have been 61 cm. The correct average must be (a) 53 cm (b) 54.5 cm (c) 55.85 cm (d) 56.15 cm

The average weight of 12 parcels is 1.8 kg. Addition of another new parcel reduces the average weight by 50 g. What is the weight of the new parcel? (a) 1.50 kg (b) 1.10 kg (c) 1.15 kg (d) 1.01 kg

The average age of 20 boys in a class is 12 years. 5 new boys are admitted to the class whose average age is 7 years. The average age of the boys in the class becomes (a) 8.2 years (b) 9.5 years (c) 12.5 years (d) 11 years

If 3x+3 + 7 = 250, the x is equal to (a) 5 (b) 3 (c) 2 (d) 1

A die with faces numbered from 1 to 6 is thrown twice. The probability, that the numbers shown up differ by 2, is (a) 1/9 (b) 2/9 (c) 3/9 (d) 4/9

In the sequence of numbers 5, 8, 15, 20, 29, 40, 53, one number is wrong. The wrong number is (a) 15 (b) 20 (c) 29 (d) 40

1 + 2 + 3 + ??. + 49 + 50 + 49 + 48 + ??. + 3 + 2 + 1 is equal to (a) 1250 (b) 2500 (c) 2525 (d) 5000

The surface area of a sphere is 64? cm2 its diameter is equal to (a) 16 cm (b) 8 cm (c) 4 cm (d) 2 cm

Each of the height and base radius of a cone is increased by 100%. The percentage increase in the volume of the cone is (a) 700% (b) 400% (c) 300% (d) 100%

A television and a refrigerator were sold for Rs. 12,000 each. If the television was sold at a loss of 20% of the cost and the refrigerator at a gain of 20% of the cost, then the entire transaction resulted in (a) No loss or gain (b) Loss of rs. 1,000 (c) Gain of rs. 1,000 (d) Loss of Rs. 1,200

A person sells a table at a profit of 10%. If he had bought the table at 5% less cost and sold for Rs. 80 more, then he would have gained 20%. The cost price of the table is (a) Rs. 3,200 (b) Rs. 2,500 (c) Rs. 2,000 (d) Rs. 200

By selling an article at 2/3 of the marked price, there is a loss of 10%. The profit percent, when the article is sold at the marked price, is (a) 20% (b) 30% (c) 35% (d) 40%

A moving train, 66 metres long, overtakes another train 88 metres long, moving in the same direction in 0.168 minutes. If the second train is moving at 30 km/r, then at what speed is the first train moving ? (a) 85 km/hr (b) 50 km/hr (c) 55 km/hr (d) 25 km/hr

Banking,

A man observed that a train 120 m long crossed him in 9 seconds. The speed (in km/hr) of the train was (a) 42 (b) 45 (c) 48 (d) 55

A constable is 114 metres behind a thief. The constable runs 21 metres and the thief 15 metres in a minute. In what time will the constable catch the thief ? (a) 19 minutes (b) 18 minutes (c) 17 minutes (d) 16 minutes