GMAT Ninja Series 3, Video 4: Word Problem Bootcamp, Pt. 2: Rates, Age Problems, & Beyond

On tougher #GMAT quant word problems, one of the most common pitfalls is blindly choosing variables that make your life difficult. In this video, you’ll learn the art of selecting intuitive, intelligent variables on rate questions, age problems, and other GMAT quant word problems.


0:00 Intro & Agenda
2:54 Question #1
8:31 Question #2
14:22 Question #3
20:22 Question #4
24:57 Question #5
31:05 Question #6
37:48 Question #7
44:40 Question #8
51:40 Question #9
58:42 Question #10

#GMATVerbal #GMATQuant #GMATPrep #GMATStudy

[ashishsinha]

Thanks Thiru Charles. You seem to be a humble person, with respect for other people’s festivals, a great thing. I think the answer to the last question is 3y/2-6. I guess 3y/2+6, as solved by you is a typo. Otherwise you are incapable of erring.

P.S. Thiru is a respectful prefix in Tamil, a South Indian language.

[jamesonenglish]

Question 9 is wrong. It's not asking how many gallons are in the tank it's asking the mpg for the city. once you find the gallons in the tank you need to divide the city miles by the number of gallons.

[tamaracarp]

Hello! Thank you for the help. Just one thing: in number 9 I’ve got the answer “16”, and according to GMAT Club It’s correct

[urjachhabra]

Thank you Charles, you make GMAT seem so easy!

[subodhwaghmare]

Charles is under arrest for being the most awesome GMAT tutor in history.

[whysoserious]

Q9, is asking how many miles per gallon did the care travel in the city not how many total gallon in the tank, so the answer should be (B) 336 miles/ 21 gallons = 16.

[rohitsaluja]

Charles thank you so much for all of your videos on both verbal and quant. You are a true master, and your expressions always crack me up. I watched 29:56 at least ten times. Thanks, man, appreciate everything. I wish, i could grab a beer with you someday

[johannakatharina]

All your videos are so helpful. Thank you Charles!

[jemimamanuel]

Hello, for q1, where is the 2/10th or 1/5 coming from. Thank you

[srilanka]

Easier way to do the last question 10 - using test cases

assume D=20, F=8, therefore(NOW) D+F = 28

In 28 years Fred will be 36

plug in Y value to answer and see if you get 36

answer is D -

(28*3)/2 -6 = 42-6 = 36

Freds age = 36

[hemantbafna]

Thank you for the video, also Charles it is great how you keep the audience engaged all the time. Bhindi Masala, Papusas!

[srilanka]

for question 9 I got 16 by doing


462x = 336 (x-6)

126x = 2016


x = 16

was this just a fluke?

[paritoshmainkar]

Did I miss anything or last answer was minus 6 instead of plus 6!!

[itsak]

hey GMAT club
in q6,
cant we use rate of k+p to find rate of m. then we go and use the rates of p and m to find out the rate of k?