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# GMAT: Math 19

100-105, pg. 165. Created by Sal Khan.

## Want to join the conversation?

• i have a question for #105... √200 can be simplified to √25x8 or 5√8 which further simplifies to 5√4x2 or 10√2. perimeter is 4(10√2)=40√2 if √2=1.4, 40(1.4)=56 did i do that correctly? thanks!
• You are correct, but I solved it a slightly different way. Since it's a cube, the right triangle is a 45-45-90 triangle, which has its sides in a ratio of 1:1:√2. so in this case, x:x:x√2, and 20=x*√2. thus x=20/√2. perimeter is simply 4(20/√2), or 80/√2, which is approx 56.5.
• What does he mean by choices? "choice b" - e.g
• He is simply talking about the answer from abcd like on a multiple choice test. You cannot see the answer choices so it is a little confusing
• For question 100, at mintues into the video, is the answer not 10%? is 10% one of the choices? The question asks for what % of funds, we only solved for x which is 6. Would we not then plug x back in (x+4)--> (6+4)= 10%?
(1 vote)
• For problem 103, shouldn't be faster if we assume a pool with like, 900 liters and do the maths on it?

I know it's great to exercise the basics, but for GMAT, shortcuts are always welcome.
(1 vote)
• Do you know all of the hard math promblem
(1 vote)
• Assignment 1: Creating a P&L Statement

Scenario A. Using the template provided create a skeletal P&L statement for a fashion retail house using the information provided below.

Gross Sales \$625,000
CRA% 6.5%
COGS 38%
Net Profit \$11,687.50

Note: This is a one-month analysis of the retail house's performance.

Complete all fields of P&L statement in dollars and percentages.

Scenario B. Consider that the lease on the retail house's building has expired and rent for the present location has just increased by \$12,000 per month.

Using the template complete the Scenario B section creating a new skeletal P&L in dollars and complete all fields in dollars and percentages.

Based on the skeletal P&L statements, what plan of action would you suggest to restore the net profit to its original positive number, as calculated in Scenario A?

Explain how your suggested action would make up for the loss.
• why are these videos so long