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The GMAT Problem Solving questions will test your ability to evaluate information and solve numerical problems. Our practice problems are designed to be very challenging in order to prepare you for the harder-level questions found on the GMAT. Answers and detailed explanations are include with each problem. Start your test prep now with our free GMAT Problem Solving practice test.
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Directions: Solve the problem and select the best of the answer choices given.
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60,000 |
150,000 |
50 |
95 |
Plugging this into the equation P + R = 160 yields:
4R – 50 + R = 160
5R – 50 = 160
5R = 210
R = 42
25% profit |
20% profit |
Let’s simplify our Profit/Loss % formula by dividing each term by the cost price: Profit/Loss % = (S/C – C/C) x 100
P/L% = (S/C – 1) x 100 We know that S/C = 4/5 for this problem. So we can plug in and solve:
P/L% = (4/5 – 1) x 100
P/L% = (-1/5) x 100
P/L% = -20%. The answer is a 20% loss.
14 |
25 |
For the first part of the trip, we know that 30 miles = 15mph x T, so we know that T = 2 hours. For the middle part of the trip, we know that D = 10mph x 3 hours, so we know that D = 30 miles. For the last part of the trip, we know that 40 miles = R x 2 hours, so we know that R = 20mph.
Now we can find the Total Distance and the Total Time. Total Distance = 30 miles + 30 miles + 40miles = 100 miles. Total Time = 2 hours + 3 hours + 2 hours = 7 hours. So the Average Rate = 100 miles/ 7 hours = 14.28mph. (B) is the closest approximation.
3 |
5 |
Time = Distance/Rate
Time spent going uphill = D /6
Time spent going downhill = D/14
Total Time = 1 hour
We can write the following equation, and solve for D:
Time taken on the uphill journey + Time taken on the downhill journey = Total Time
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2/12 |
7/12 |
If the first person we chose was from the second group (probability = 3/9), the odds that the second person would be one of their partners would be 2/8. The numerator is 2 this time because each person in the second group has two partners instead of one. 3/9*2/8 = 6/72 = 1/12.
Since EITHER of these outcomes (picking the first person from the first group OR the second group) produces our desired result, we’ll add these probabilities. 1/12 + 1/12 = 2/12 = 1/6.
Therefore, the probability that the two doctors are NOT working together is 1 – 1/6 = 5/6.
Another way to think of this question is to assign letters to each doctor and group them by clinical trial. So AB, CD, EF are from the first group, and GHI are from the second group. There are 6 ways of choosing a pair that are working together: AB, CD, EF, GH, GI, or HI. And we can quickly use the combination formula to find the total possible ways to choose 2 from 9. 9C2 = 9! / 2! 7! = 9 x 8/2 = 72/2 = 36. 6/36 = 1/6.
g(z) = 1 – z2 |
g(z) = z2(1 – z)2 |
If you notice that, then it very easy to find the solution, replace each function with 4 and -3 instead of z, and see if f(4)=f(-3).
Let’s try choice (A):
F(-3) = 1 – (-3) = 4
F(4) = 1 - (4) = -3
They are NOT equal. Eliminate.
Repeat this process for the other answer choices, until you find one for which f(4) = f(-3). That choice is D:
F(-3) = (-3)2 (1 – (-3))2 = (9)(16)
F(4) = (4)2 (1 – (4))2 = (16)(9)
F(-3) = F(4).
(z – 2)2 = (z – 4) – z2 |
(z – 2)2 = z2 – (z - 1)2 |
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We would use the Pythagorean Theorem to find the value of z:
a2 + b2 = c2
(z – 2)2 + (z – 4)2 = z2
Remember that “c” is always the hypotenuse, or the longest side. Only choice (A) matches this equation.
10 |
45 |
The area of a rectangle is lw. Here we are told that lw = 8w. That means the length is 8. We also know that the distance from P to LM = 3, so the length of the rectangle must be 6. Let’s re-draw the shape:
The radius of the circle, LP, is the hypotenuse of a right triangle whose other two sides are half the length and half the width of the rectangle. Since it’s a classic Pythagorean triplet (3:4:5), we don’t need to use the Pythagorean theorem.
Plug the radius into the formula for circumference: C = 2πr. C = 2*π*5. The circumference is approximately 10π, or a number slightly larger than 30.
(w + 2) – zx |
xw + 2 – (z – w) |
We want x < w < z. Let’s pick x=3, w=4, z=6
For a job that took 4 hours, the client is charged $4/hour for the first 3 hours, then $6/hour for the last hour. The total cost would be $4(3) + $6(1) = $12 + $6 = $18.
For a job that took 6 hours, the client is charged $4/hour for the first 3 hours, then $6/hour for the last three hours. The total cost would be $4(3) + $6(3) = $12 + $18 = $30. The difference in price is $12.
Let’s plug our values into the expression: (w+2)(z-w) = (4+2)(6-4) = 6*2 = 12.
Here is the algebraic solution:
If the grass trimming job took z hours, the total cost is: wx + (z-x)(w+2)
If the grass trimming job took w hours, where x < w < z, the total cost is: wx + (w-x)(w+2)
The extra cost will be:
[wx + (z-x)(w+2)] – [wx + (w-x)(w+2)]
= (z-x)(w+2) - (w-x)(w+2)
= (w+2)[(z-x) – (w-x)]
= (w+2)(z-w)
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