Free GMAT SECTION 2: QUANTITATIVE Exam Braindumps (page: 59)

Page 59 of 182

Out of a box that contains 4 black mice and 6 white ones, three are picked up. What is the probability that all three will be black mice?

  1. 8/125.
  2. 1/30.
  3. 2/5.
  4. 1/720.
  5. 3/10.

Answer(s): B

Explanation:

The probability for the first one to be black is: 4/(4+6) = 2/5. The probability for the second one to be black is: 3/(3+6) = 1/3. The probability for the third one to be black is: 2/(2+6) = 1/4.
The probability for all three events is (2/5) x (1/3) x (1/4) = 1/30.



A car is driving at 60 Km/h for 20 minutes, and then drives at 90Km/h for another 40 minutes. What is the average speed of the car?

  1. 80.
  2. 75.
  3. 70.
  4. 65.
  5. 54.

Answer(s): A

Explanation:

The average speed is equal to: (Total distance)/(Total time) = (60 x 1/3 + 90 x 2/3)/1 = 80 Km/h.



Two grandfathers can nit a sweater in 6 days. Two grandfathers and one grandmother can nit a sweater in 3 days. How many days will it take the grandmother to nit a sweater all by her self?

  1. 4.5.
  2. 5.
  3. 5.5.
  4. 6.
  5. 6.5.

Answer(s): D

Explanation:

Two grandfathers and a grandmother can nit a sweater in 3 days, therefore they can nit 2 sweaters in 6 days. Because two grandfathers can nit 1 in 6 days then the other sweater is done by the grandmother, she can nit 1 sweater in 6 days.



Two adjacent angles of a parallelogram are in the ratio of 1:3. What is the smaller angle of the two?

  1. 30.
  2. 45.
  3. 90.
  4. 135.
  5. 180.

Answer(s): B

Explanation:

The sum of two adjacent angles in a parallelogram is 180. 180 divided by 4(1+3) is 45 and that is the size of the smallest among the angles.



Page 59 of 182



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