Have questions about your preparation or an upcoming test? Need help modifying the Study Plan to meet your unique needs? No problem. Just book a Skype meeting with Brent to discuss these and any other questions you may have.

- Video Course
- Video Course Overview
- General GMAT Strategies - 7 videos (free)
- Data Sufficiency - 16 videos (free)
- Arithmetic - 38 videos
- Powers and Roots - 36 videos
- Algebra and Equation Solving - 73 videos
- Word Problems - 48 videos
- Geometry - 42 videos
- Integer Properties - 38 videos
- Statistics - 20 videos
- Counting - 27 videos
- Probability - 23 videos
- Analytical Writing Assessment - 5 videos (free)
- Reading Comprehension - 10 videos (free)
- Critical Reasoning - 38 videos
- Sentence Correction - 70 videos
- Integrated Reasoning - 17 videos

- Study Guide
- Blog
- Philosophy
- Office Hours
- Extras
- Prices

## Comment on

Elvira’s Tennis Wins## I need help with the numbers

I paused the video and selected t=20 and f=4.

I had 2 of f=4 games won and then 1/4 of 16 games won.

So in total i had 6/20 or 3/10 of games won. When I plugged the numbers in, a & b came back as 30% and the rest were off.

If D is the correct answer, can you help me find what I did wrong when plugging my selected numbers in?

Last of all, if i pay the $77 subscription will i get more videos then what is currently free?

thank you.

Rene

## With your chosen numbers, we

With your chosen numbers, we can conclude that, if the INPUT is T = 20 and F = 4, then the OUTPUT must be 30 (i.e., 30%)

That's perfect so far. Now let's plug in those values for T and F.

A) 3(100 + 20)/4 = 90. This doesn't match the required OUTPUT of 30. ELIMINATE A.

B) 50(20 - 8)/20 = 30. This matches the required OUTPUT of 30. KEEP B.

C) 100(20 - 4)/80 = 20. This doesn't match the required OUTPUT of 30. ELIMINATE C.

D) 25(4 + 20)/20 = 30. This matches the required OUTPUT of 30. KEEP D.

E) 50(8 + 20)/20 = 70. This doesn't match the required OUTPUT of 30. ELIMINATE E.

At this point, we're left with answer choices B and D. So, you'd have to plug in a new set of values of eliminate one of the two remaining answer choices.

As for your other question, if you purchase an account, you will have access to all of the videos on the site.

## Hi!

Quick question, in A, how did you get 3(100 + 20) / 4?

If T=20 & F=4 and the formula is 3 (5F + 20)/4 ; I'm getting: 3(20+20)/4 = 30

## If F = 20, then 5F = 5(20) =

If F = 20, then 5F = 5(20) = 100

So, we get: 3(5F + 20)/4 = 3(100 + 20)/4

You have 3(20 + 20)/4

Cheers,

Brent

## I felt your algebraic

Also initially I converted % to decimal 0.5F+0.25(F-T)/T, this gives 0.25(F+T)/T, then I realized as question asks what percent so need to multiply it by 100- is this logic correct?

## "I felt your algebraic

"I felt your algebraic approach calculation is complicated, I would simply calculate it as 50F+25(T-F)/T i.e. 25(F+T)T ..hope this is also right."

Yes, that's correct. The only difference with that solution is that you are automatically simplifying the fractions. For example, I have (100)(F/2), and you have 50F.

"Also initially I converted % to decimal 0.5F+0.25(F-T)/T, this gives 0.25(F+T)/T, then I realized as question asks what percent so need to multiply it by 100- is this logic correct?"

Yes, that logic is correct.

## Thanks, your help is much