Q. Of the two kinds of alloys, silver and copper are contained in the first in the ratio 5:1 and in the other in the ratio 7:2. In what ratio of the two alloys should be melted and mixed together so as to make up a 5 kg mass with 80% of silver -
1) 2:3
2) 4:5
3) 3:4
4) 1:2
Q. Calculate the number of bricks, each measuring 25 cm * 12.5 cm * 7.5 cm required to build a wall 6 meters long, 5 meters high, and 50 cm thick, while the mortar occupies 5% of the volume of the wall -
1) 8060
2) 6180
3) 6080
4) None of these
Q. In a division sum, the divisor is ten times the quotient and five times the remainder. If the remainder is 46, determine the dividend.
1) 5336
2) 5634
3) 5636
4) 5633
Q. The ratio of the number of boys and girls in a school is 4 : 1. If 75% of boys and 70% of the girls are scholarship holders, then the percentage of students who do not get scholarships is -
1) 50
2) 28
3) 75
4) 26
Q. The speed of a metro engine is 42 km./ hr when no compartment is attached and the reduction of speed is directly proportional to the square root of the number of the compartment attached. If the engine is 24 km/hr when 9 compartments are attached, the maximum number of compartments that can be carried by the engine is -
1) 48
2) 47
3) 49
4) None of these
Q. Total expenses of a boarding house are partly fixed and partly varying linearly with the number of boarders. The average expense per boarder and Rs. 700 when there are 25 boarders and Rs. 600 when there are 50 boarders. What is the average expense per boarder when there are 100 boarders?
1) Rs.560
2) Rs.540
3) Rs.550
4) None of these
Q. Six parts of oil are mixed with one part of water. When five liters of water are added to the mixture, the mixture is found to contain 5 times as much oil as water. How many liters of oil was there in the first mixture -
1) 150
2) 120
3) 100
4) None of these
Q. A machinist by increasing his normal rate of work by 12.5 % could produce 15 items more, in a given period of time. How many items can he produce if he works at 80% of his normal rate?
1) 100
2) 90
3) 80
4) 96
Q. In a History examination, the average for the entire class was 80 marks. If 10% of the students of scored 95 marks. and 20% scored 90 marks, what were the average marks of the remaining students in the class?
1) 65.5
2) 85
3) 75
4) 72.5
Q. 150 cc of pure alcohol is diluted by adding 650 cc of water. The new 800 cc mixture contains the following quantity of pure alcohol -
1) 0.65 litre
2) 0.15 litre
3) 0.40 litre
4) None of these
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