The light in a restroom operates with a 15-minute timer…
December 15, 2017
Solution: We are looking for two consecutive times (when the door opened) with a gap of more than 15 minutes, since only then the light would be off. Since …
For each student in a certain class, a teacher adjusted…
December 15, 2017
GMAT OFFICIAL GUIDE PS Solution: Let’s review two rules for the standard deviation: 1. Adding a constant to each value in a data set does not change the value …
Clarissa will create her summer reading list by randomly…
December 15, 2017
GMAT OFFICIAL GUIDE PS Solution: Since the order of the books in her list matters, we use permutation. Thus, the number of ways 4 books can be chosen and …
If X is the hundredths digit in the decimal 0.1X and if Y is the…
December 15, 2017
GMAT OFFICIAL GUIDE PS Solution: We are given two decimals: 0.1X and 0.02Y To make 0.1X the greatest, we can let X = 9 and we have: 0.19 To …
The graph shows the number of computers assembled during
December 15, 2017
GMAT OFFICIAL GUIDE PS Solution: Let’s test each answer choice: A) From Day 1 to Day 2 |(12 – 20)/20| x 100 = |-8/20| x 100 = 40% B) …
The table shows the amount budgeted and the amount spent…
December 15, 2017
GMAT OFFICIAL GUIDE PS Solution: Let’s take 6% of each value budgeted: Payroll: 110,000 x 0.06 = 6600 Since 117000 – 110,000 = 7,000, the amount spent differed by …
GMAT OFFICIAL GUIDE PS -The symbol ∆ denotes one of the four arithmetic operations…
December 14, 2017
The symbol ∆ denotes one of the four arithmetic operations… Solution: Let’s analyze the given inequality: If ∆ = addition: 6 + 3 ≤ 3 9 ≤ 3 Since …
A worker carries jugs of liquid soap from a production line to a
December 14, 2017
GMAT OFFICIAL GUIDE PS Solution: After 17 trips, the worker has carried 17 x 4 = 68 jugs. From those 68 jugs, 68/7 = 9 cartons have been filled, …