GMAT Club Forum - Forums > Problem Solving (PS)

Bunuel wrote:

What is the percent profit made on the sale of 1,000 shares of stock bought at $10 per share and sold at $12 per share?

A. 0.2%
B. 2%
C. 16 2/3%
D. 20%
E. 25%

1000*12-1000*10/10^5
= 20 %
IMO D

Bunuel wrote:

At the Frosty Ice Cream store, the number of cones sold fell by 20 percent in November. If sales fell by a further 25 percent in December, what was the percent decrease in the number of cones sold in the whole two-month period?

A. 10%
B. 20%
C. 35%
D. 40%
E. 45%

let intial be 100
100*.8*.75= 60
fall would be 100-60/100 = 40% IMO D

p= 2m
P-10=1/2(m-10)
Solving
M= 10
P =20
Total = 30 answer is C

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Bunuel wrote:

In a group of 60 workers, the average salary is $80 a day per worker. If some of the workers earn $75 a day and all the rest earn $100 a day, how many workers earn $75 a day?

A. 12
B. 24
C. 36
D. 48
E. 54

total salary = 80*60 = 4800$

so
we can say 75*x+100* ( 60-x)= 4800
solve for x
x=48 IMO D

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Hello,
I have a question:
For Statement 1:
if we take consecutive even numbers {2,4,6}:
When lowest number is removed, set becomes {4,6} - the average 5
When the highest number is removed, set becomes {2,4} - the average is 3.
Why above presented can not prove statement 1 as insufficient?

Can someone explain..?

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Bunuel wrote:

A chef mixes P ounces of 60% sugar solution with Q ounces of a 10% sugar solution to produce R ounces of a 25% sugar solution. What is the value of P?

(1) Q = 455 mL
(2) R = 650 mL

Kudos for a correct solution.

From the Rule of Alligations:

$\frac{Q}{P}$ =$\frac{60-25}{25-10}$

$\frac{Q}{P}$ =$\frac{7}{3}$

St 1 : Q is Given

P can be found

Sufficient

St 2 : R is Given

R = P + Q

Two Equations, Two unknowns

P can be found

Sufficient

Choice D
...

Hi Bunuel,

Could you please provide your feedback on how to solve this problem? I am stuck on C; however, the correct answer is E.

Thank you!

Bunuel wrote:

If a sequence of consecutive integers of increasing value has a sum of 63 and a first term of 6, how many integers are in the sequence?

(A) 11
(B) 10
(C) 9
(D) 8
(E) 7

(1/100) km per sec
1 Hour = 60 minutes= 3600 seconds ===> 3600 seconds per hour
Kilometers traveled by car per hour = ( 1/ 100) x (3600) = 36 km/hour

Answer Option C is Correct

If John buys a stereo marked down 7 percent from its $650 original price while Sally buys the same stereo marked down only 5 percent, how much more does Sally pay for the stereo?

7% = 5% + 1% + 1%
10% of 650 = 65 ===> 1% of 650 = 6.5
5% of 650 = 65/2 = 32.5

7% of 650 = 32.5 + 6.5 + 6.5 = 45.5
John's Buying Price = 650 - 45.5 =604.5
Sally's Buying Price = 650 - 32.5 =617.5
Difference = 617.5 - 604.5 = $13

Answer Option C is Correct.

If a train travels m miles in 5 hours, how many miles will it travel in 25 hours?

m miles in 5 hours
25 hours = 5 Times 5 hours = 5 x 5 Hours
Therefore, in 25 hours train will travel = 5m miles

Answer Option C is Correct

Project DS Butler: Day 62: Data Sufficiency (DS123)

For DS butler Questions Click Here

Bumping for DS butler Projec

Project DS Butler: Day 62: Data Sufficiency (DS124)

For DS butler Questions Click Here

Bumping for DS butler Projec

Record Price = 60 % of Compact Disk Price
If a compact disk is priced at $15, how much less does the record cost?
$ 15 x 0.4 = $6
Answer Option B is Correct

Project DS Butler: Day 63: Data Sufficiency (DS125)

For DS butler Questions Click Here

Bumping for DS butler Projec

Speed of Horse = 20/6 miles /hr
Speed of Mule = 2/3 Speed of Horse = (2/3) x (20/6) = 20/9 miles /hr

Time = Distance /Speed
Time required for Mule to complete the travel = (20miles) / (20/9) miles/hr = 9 hours

Answer Option C is Correct

Cost Price = 90 cents
Selling Price = $1.2
Profit = 30 cents
Profit % = (Profit/Cost Price) x 100 %
= (30/90) x 100 %
= 33 1/3%
Answer Option C is Correct

Tanya prepared 4 different letters to be sent to 4 different addresses. For each letter she prepared an envelope with its correct address. If the 4 letters are to be put in 4 envelopes at random, what is the probability:

A. That no letter will be put into the envelope with its correct address?

B. That all letters will be put into the envelope with its correct address?

C. That only 1 letter will be put into the envelope with its correct address?

D. That only 2 letters will be put into the envelope
...

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