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GRE Math

Paperback Textbooks (New and Used)

 Word Problems GRE Strategy Guide  Math Workout for the GRE, 3rd Edition (Graduate School Test Preparation)  GRE: Test Preparation Module Math Test Taking Strategies   McGraw-Hill Education 500 Questions to Know by Test Day: Math for the GRE Test (Mcgraw Hill's 500 Questions to Know By Test Day)

More Books and School Supplies


Electronic Textbooks

CliffsNotes GRE Math Review  GRE Word Problems  GRE Math Strategies   5 lb. Book of GRE Practice Problems


Examples

Probability: (i) What is the probability of drawing an ace from a well shuffled deck of cards?
Since there are 52 cards in the deck and there are only 4 aces, the probability of drawing an ace is 4/52 or 1/13 which is 7.7%.

(ii) In a bag there are 6 blue marbles, 4 red and 3 green. If the bag is shaken, what is the probability that a red marble will be drawn?
Total number of marbles in the bag is 13. Probability of drawing a red is 4/13.

Compound interest: If $1,000.00 is invested at 5% compounded annually, how much will be in the account at the end of 3 years?
Applying the formula A = P(1 + i) ͭ  and substituting the values for P = 1000, i = 0.05 and t = 3
Amount = A = 1000(1 + 0.05)

A = 1000(1.05) = 1000(1.1576) = 1157.63

Amount in the account at the end of the 3 year period is $1,157.63

Equations with 3 unknowns:
x + y  + z = 18  => Equation 1
3x + 4y + 5z = 72  => Eq. 2
x + z = 8  => Eq. 3

Find the values of x, y and z.

From Equation 3: 
If x + z = 8
Then x = 8 z
Substituting the value of x in either 1 or 2
Say Eq. 1:
8 z + y + z = 18
8 + y = 18 (z is eliminated)
y = 18 8 = 10
Substituting the values of x and y in 2
3(8 z) + 4(10) + 5z = 72
24 -3z + 40 + 5z = 72
2z = 72 24 40 = 72 64
2z = 8
z = 4
x = 8 4 = 4

Therefore, x = 4, y = 10 and z = 4
 

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