916 . A jar contains 10 red marbles and 30 green marbles . How many red marbles must be added to the jar so that 60% of the marbles will be red ?
  • A. 25
  • B. 35
  • C. 40
  • D. 60
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917 . A jar contains 4 red toothpicks , 10 blue toothpicks and 6 yellow toothpicks. If three toothpicks are removed from the bag at random and no toothpick is returned to the bag after removal, what is the probability that all three toothpicks will be blue?
  • A. 1/2
  • B. 1/8
  • C. 3/20
  • D. 2/19
  • E. None of these
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918 . A jar contains a mixture of oil and water in the ratio 22 :3 . 50 litres of the mixture was taken out and 25 litres of water was added to it. If water was 34% in the resultant mixture, what was the initial quantity of the mixture (in litres ) in the jar?
  • A. 175
  • B. 150
  • C. 75
  • D. 125
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919 . A jar contains milk and water in the ratio 5: 1. If the quantity of milk is more than that of water by 8 liters, then what is the quantity of water?
  • A. 1.5 liter
  • B. 2 liter
  • C. 6 liter
  • D. 8 liter
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920 . A jar contains red balls and green balls in the ratio 3:1. If the jar contains only the two types of balls, which of the following cannot be the number of balls in the jar ?
  • A. 96
  • B. 80
  • C. 72
  • D. 54
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921 . 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?
  • A. 8
  • B. 10
  • C. 4
  • D. 6
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922 . A jar contains white, red and green marbles in the ratios 2: 3: 5 six more green marbles are added to the jars and then the ratio becomes 2: 3: 7 Hoe may white marbles are there in the jar?
  • A. 5
  • B. 6
  • C. 9
  • D. 10
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923 . A jogger running at 9 km/hr alongside a railway track is 240 meters ahead of the engine of a 120 meters long train running at 45 km/hr in the same direction. In how much time will the train pass the jogger?
  • A. 3.6 sec
  • B. 18 sec
  • C. 36 sec
  • D. 72 sec
  • E. None of these
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924 . A laborer is paid Tk.20 per hour for an 8-hour day. If he works overtime (above 8 hours) in a single day, he is paid 1.5 times the rate he is paid for regular hours. If the laborer receive Tk.200 for a single day's work. How long did he work on that day?
  • A. 9 hours 20 minutes
  • B. 8 hours 50 minutes
  • C. 6 hours 20 minutes
  • D. 9 hours 50 minutes
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925 . A ladder is placed against a wall such that its foot is at a distance of 2.5 m from the and its top reaches a window 6 m about ground. Find the length of the ladder.
  • A. 6.5 m
  • B. 8.5
  • C. 4.5
  • D. 2.5 m
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926 . A ladder rests against a wall that is perpendicular to the ground. If the bottom of the ladder is 4m away from the bottom of the wall, while the top of the ladders is at a height of 3m what is the length of he ladder?
  • A. 7m
  • B. 35m
  • C. 5m
  • D. 25m
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927 . A large cube is formed from the material obtained by melting three smaller cubes of 3,4 and 5 cm side. What is the ratio of the total surface areas of the smaller cubes and the large cube?
  • A. 2 : 1
  • B. 3 : 2
  • C. 25 : 18
  • D. 27 : 20
  • E. None of these
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928 . A leading library charges c cents for the first week that a book is loaned and f cents for each day over one week. What is the cost for taking out a book for d days. Where d is greater than?
  • A. c +fd
  • B. cd
  • C. c +f(d-7)
  • D. cd +f
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929 . A line segment is drawn from point (8, -2) to point (4,6). The coordinates of the mid point of this line segment are--
  • A. (12, 4)
  • B. (12, 8)
  • C. (6, 4)
  • D. (6,2)
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930 . A loan was repaid in two annual installments of Tk.121 each. If the rate of interest be 10% per annum compounded annually the sum borrowed was.
  • A. 217.80
  • B. 280
  • C. 200
  • D. 210
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