GMAT Test

GMAT Test practice questions, page 18 of 65, with answer review and explanations.

Question 86

A seven-digit combination lock on a safe has zero exactly three times, does not have the digit 1 at all. What is the probability that exactly 3 of its digits are odd?

  1. 9/16
  2. 1/2
  3. 1/3
  4. 1/4
  5. 1/6

Question 87

Pipe A fills a swimming pool in 4 hours. Pipe B empties the pool in 6 hours. If pipe A was opened at 8:00 am and Pipe B at 9:00 am, at what time will the pool be full?

  1. 15:00
  2. 17:00
  3. 18:00
  4. 19:00
  5. 20:00

Question 88

In a school with 5 classes, each class has 2 students less than the previous class. How many students are there in the largest class if the total number of students at school is 95?

  1. 17
  2. 19
  3. 21
  4. 23
  5. 25

Question 89

A 48 gallon solution of salt and water is 10% salt. How many gallons of water must be added to the solution in order to decrease the salt to 8% of the volume?

  1. 8
  2. 12
  3. 13
  4. 14
  5. 16

Question 90

The `Racing magic` takes 120 seconds to circle the racing track once. The `Charging bull` makes 40 rounds of the track in an hour. If they left the starting point together, how many minutes will it take for them to meet at the starting point for the second time?

  1. 3
  2. 6
  3. 9
  4. 12
  5. 15