586 . 3 pumps working 8 hours a day can empty a tank in 2 days. How many hours a day must 4 pumps work to empty the tank in 1 day?
  • A. 9
  • B. 10
  • C. 11
  • D. 12
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587 . 3 pumsps, working 8 hours a day, can empty a tank in 2 days. How many hours a day must 4 pumps work to empty the same tank in 1 day?
  • A. 9 hours
  • B. 10 hours
  • C. 11 hours
  • D. 12 hours
  • E. None of these
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588 . 3 years ago, the average age of a family of 5 members was 17 years. With the birth of a new baby, the average remains the same even today. Find the age of the baby.
  • A. 1 year
  • B. 2 year
  • C. 2.5 year
  • D. 3 year
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589 . 3/4th of square were taken to form shape A and the rest was made to form shape B. Shape A was divided into four equal squares (Shape C), what will be the ratio of the one shape C to one shape B.
  • A. 1:4
  • B. 3:16
  • C. 1:2
  • D. 3:4
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590 . 30% apples out of 450 are rotten . How many apples are in good condition?
  • A. 125
  • B. 315
  • C. 240
  • D. 180
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591 . 30% of 80 is what percent of 24?
  • A. 1
  • B. 10
  • C. 50
  • D. 100
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592 . 30 = ?
  • B. 3
  • C. 1
  • D. 2
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593 . 30 labourers, working 7 hours a day can finish a piece of work in 18 days. If the ladourers work 6 hours a day, then the number of labourers to finish the same piece of work in 30 days, will be.
  • A. 15
  • B. 22
  • C. 21
  • D. 25
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594 . 30 men took a dip in a water tank 20m long and 15m broad on a religious day.If the aveage water displacement of water by a man is 2m3, then the rise in the water level in the tank will be --
  • A. 20 cm
  • B. 50 cm
  • C. 100 cm
  • D. 200 cm
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595 . 30 pens and 75 pencils altogether were purchased for Tk.510. If the average price of a pencil was Tk.2, what was the average price of a pen?
  • A. 9tk
  • B. 10tk
  • C. 11tk
  • D. 12tk
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596 . 35% of Nabila's income is equal to 25% of Nuru's income. The ratio of their income is
  • A. 5 :7
  • B. 4 :7
  • C. 7 : 3
  • D. 4 : 3
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597 . 35% of Rifat's income is equal to 25% of Reaz's income . The ratio of their income is
  • A. 7 : 5
  • B. 4 : 3
  • C. 4 : 7
  • D. 5 : 7
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598 . 36 identical chairs must be arranged in rows with equal number of chairs in each row. Each row must be contain at least 3 chairs & there must be at least 3 rows. How many different arrangements are possible?
  • A. 2
  • B. 4
  • C. 5
  • D. 6
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599 . 36 men can complete a piece of work in 18 days. In how many days will 27 men complete the same work?
  • A. 12
  • B. 22
  • C. 18
  • D. 24
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600 . 3640 ÷ 14 × 16 +340 = ?
  • A. 0.70
  • B. 3525
  • C. 4500
  • D. None of these
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