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The 20"-diameter wheels of a car rotates at rate of 24 revolutions per minute, while the 30"-diameter wheels of another car travels at a rate of 18 revolutions per minute. What is the ratio of the speed of the second car to that of the first?

1. A 1 : 1
2. B 4 : 3
3. C 6 : 5
4. D 9 : 8

A jar contains white, red and green marbles in the ratio 2 : 3 : 4. Five more green marbles are added to make the ratio 2 : 3 : 5. How many white marbles are there in the jar?

1. A 10
2. B 4
3. C 6
4. D 8

If x : y = 5 : 3, then (8x – 5y) : (8x + 5y) =?

1. A 3 : 11
2. B 3 : 12
3. C 5 : 11
4. D 8 : 13

Three individuals contributed Tk.8000 each toward the purchase of a computer. If they bought the computer on sale for Tk.19500 plus 10% sales tax, how much money should be refunded to each individual?

1. A Tk.1500
2. B Tk.1950
3. C Tk.650
4. D Tk.850

The ratio between the length and breadth of a field is 7 : 5. The perimeter of the field is 360 meter. What is the area of the field?

1. A 31000 sq. meter
2. B 31500 sq. meter
3. C 7875 sq. meter
4. D 8775 sq. meter

Two-fifths of the socks in box are red, one-third is blue and the rest are green. What is the ratio of the green socks to the blue socks?

1. A 4 : 5
2. B 5 : 6
3. C 6 : 7
4. D 7 : 8

If x : y = 2 : 3, and m : n = 9 : 4, find the ratio xn : ym.

1. A 2 : 3
2. B 27 : 8
3. C 3 : 2
4. D 8 : 27

Three boys have marbles in the ratio of 19 : 5 : 3. If the boy with the least number has 9 marbles, how many marbles does the boy with the highest number have?

1. A 15
2. B 38
3. C 57
4. D 76

In what ratio must tea at Tk. 62 per kg be mixed with tea at Tk. 72 per kg so that the mixture must be worth Tk. 64.50 per kg?

1. A 3 : 1
2. B 3 : 2
3. C 3 : 5
4. D 4 : 3

A, B and C enter into partnership with investments in the ratio of 5 : 7 : 8. If at the end of the year A's share of profit is Tk.42360, ow much is the total profit?

1. A Tk.168440
2. B Tk.169440
3. C Tk.183000
4. D Tk.196700

A certain pole casts a shadow 24 feet long. At the same time another pole which is 3 feet high casts a shadow 4 feet long. How high is the first pole given that the heights and shadows are in proportion?

1. A 18
2. B 19
3. C 20
4. D 21

Cheese, egg and beef sandwiches were made for a picnic in a ratio of 5 to 7 to 8. If the total of 120 sandwiches were made, how hany egg sandwiches were made?

1. A 15
2. B 30
3. C 38
4. D 42