World Problems

Question 1

How do you translate this statement: “If Kelly received 1/3 times more votes than Mike”

Answer 1

K = M + 1/3 M

Question 2

T or F. On data sufficiency, you can’t find solutions of variables with limited information if you know those variables must be integers.

Answer 2

False. You can

See page 18 and 19 of Manhattan Prep

Question 3

A passenger train leaves the train depot 2 hours after a freight train left the same depot. If it overtakes the freight train in three hours, what is the same value in this problem?

Answer 3

Distance.

Note: Both trains traveled from the same spot and catch up at the same spot in the future.

Question 4

Describe what condition is the same when both objects travel either:

1) towards each other and meet at one point
2) away from each other
3) in the same direction on same path (to catch up with each other) with one being further away than the other.

Answer 4

objects travel in the same time (t)

Question 5

If two objects travel towards each other, what is their rate of travel?

Answer 5

The rate is the addition of object’s rates

Note: The objects reduce the distance themselves at this ADDITION rate

Question 6

If two objects travel away from each other, what is their rate of travel?

Answer 6

The rate is the addition of object’s rates

Note: The objects increase the distance themselves at this ADDITION rate

Question 7

In “working together” problem, what and when we can directly add value of each machine/ person?

Answer 7

when there is information about certain amount of work given in an hour, we can add all together the RATES

Question 8

when we are not given directly the amount of work produced in an hour, what do we do in the “working together” problem?

Answer 8

We find the amount of work in an hour: 1/x , 1/y, 1/z and ADD them up.

Question 9

On the GMAT, what is the range that weighted average will always be in?

Answer 9

between 20 and 30

Question 10

in Weight Average problems, what is the weight?

Answer 10

It is the ratio

Question 11

in Weight Average problems, what is the data point?

Answer 11

It is the specific value (i.g: 20 and 30)

Question 12

When do we use Venn Diagram to solve set problems?

Answer 12

It should be used only for problems that involve three sets.

Question 13

What do we use to solve two-set problems?

Answer 13

Double-set matrix

Question 14

T or F. If there is actual quantities appear in the problem, you cannot assign a number to solve for solution

Answer 14

T.

p.g 88 Manhattan