The average American spends y dollars on food per month,

Expert replies

Previous Topic Next Topic

AAPL: Moderator; Posts: 2672; Joined: Sun Oct 29, 2017 2:08 pmFollowed by: 2 members

by AAPL » Thu Jul 04, 2019 5:50 pm

Timer

00:00

Answers

Stats

Difficulty—

Princeton Review

The average American spends y dollars on food per month, except during January, when food purchases are x percent lower than they are in other months. Which of the following represents food purchases, in dollars, for the first 9 months of a year?

A. $9y - \frac{xy}{100}$

B. $9y + xy$

C. $9y - xy$

D. $\frac{9y-xy}{9}$

E. $\frac{y-xy}{6}$

OA A

Like this post

Source: Beat The GMAT — Problem Solving | Thu Jul 04, 2019 5:50 pm

GMAT/MBA Expert

Ian Stewart: GMAT Instructor; Posts: 2623; Joined: Mon Jun 02, 2008 3:17 amFollowed by: 355 members; Location: Montreal; Thanked: 1090 times; GMAT Score:780

by Ian Stewart » Sat Jul 06, 2019 4:31 am

AAPL wrote: The average American spends y dollars on food per month, except during January, when food purchases are x percent lower than they are in other months. Which of the following represents food purchases, in dollars, for the first 9 months of a year?

Whose food purchases? As the question is written, it's impossible to tell what they're asking for. Assuming they mean to ask about the spending of an average American: with no discount, they'd spend $9y in nine months. They save x% in one month, so save (x/100)y = xy/100 dollars in one month. So the answer is 9y - xy/100 dollars.

For online GMAT math tutoring, or to buy my higher-level Quant books and problem sets, contact me at ianstewartgmat at gmail.com

ianstewartgmat.com

Like this post

deloitte247: Legendary Member; Posts: 2214; Joined: Fri Mar 02, 2018 2:22 pmFollowed by: 5 members

by deloitte247 » Sat Jul 06, 2019 7:19 am

Question: Which of the following represents food purchases in dollar for the first 9 months of a year?

The average American, spent $y on food per month,
In January, Food purchases are x% lower than other months.
$$x\ \%\ y=\frac{x}{100}\cdot\frac{y}{1}=\frac{xy}{100}$$
$$Then,\ January\ food\ purchase=y-\frac{xy}{100}$$
So, food purchase for the first 9 months of a year,
$$January;\ y-\frac{xy}{100}$$ $$other\ 8\ months=y$$ $$Total\ \cos t=y-\frac{xy}{100}+\left(8y\right)$$

Like this post

Post new topic Post Reply

• Page 1 of 1

GMAT Course Reviews

560 reviews

1168 reviews

431 reviews

359 reviews

147 reviews

5/5

5 Star (560 Reviews)

"Target Test Prep is the closest to the official version of the GMAT exam, about 99% accuracy in terms of the quality and quantity of information. The course has excellently created singular sets of focused lessons and tests for every possible topic that one could come across in the official GMAT exam."

"The TTP course maximizes the efficiency of the time you spend studying. It will take time and effort but I could almost guarantee that if you complete the course exactly as it is laid out you will get an amazing score. They also have a very responsive team willing to help with any questions you might have."

"TTP has two things that I think no other test prep company offers: A teaching approach that reinforces understanding and an attitude that will give you the mental preparedness needed to succeed on the test. TTP gives you a deep understanding of the concept you need to know while teaching you how to think."

Write a Review