steam clean a room

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sanju09: GMAT Instructor; Posts: 3650; Joined: Wed Jan 21, 2009 4:27 amFollowed by: 80 members; Location: India; Thanked: 267 times; GMAT Score:760

by sanju09 » Thu Mar 19, 2009 5:43 am

What is the cost in dollars to steam clean a room W yards wide and L yards long it the steam cleaners charge 10 cents per square foot?
A. 0.9 W L
B. 0.3 W L
C. 0.1 W L
D. 9 W L
E. 3 W L

OA A

The mind is everything. What you think you become. -Lord Buddha

Sanjeev K Saxena
Quantitative Instructor
The Princeton Review - Manya Abroad
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Source: Beat The GMAT — Problem Solving | Thu Mar 19, 2009 5:43 am

DanaJ: Site Admin; Posts: 2567; Joined: Thu Jan 01, 2009 10:05 amFollowed by: 550 members; Thanked: 712 times; GMAT Score:770

by DanaJ » Thu Mar 19, 2009 5:57 am

1 yard = 3 feet long. I think you should have provided this info in your question, since I've noticed that this is the common practice among GMAT questions. There is a reasoning behind this: GMAT is an "international" test, and, for instance, where I come from we only use meters (without wikipedia I wouldn't have been able to solve this question).

W yards = 3W feet
L yards = 3L feet

Surface of the room in square feet: 3W * 3L = 9WL.
Now, 10 cents per square foot means you're paying 9WL * 10 = 90WL cents for the entire room. However, the problem is asking for price in dollars. Since 1 dollar = 100 cents, 90WL cents will be 0.9WL dollars.

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sanju09: GMAT Instructor; Posts: 3650; Joined: Wed Jan 21, 2009 4:27 amFollowed by: 80 members; Location: India; Thanked: 267 times; GMAT Score:760

by sanju09 » Thu Mar 19, 2009 6:10 am

DanaJ wrote:1 yard = 3 feet long. I think you should have provided this info in your question, since I've noticed that this is the common practice among GMAT questions. There is a reasoning behind this: GMAT is an "international" test, and, for instance, where I come from we only use meters (without wikipedia I wouldn't have been able to solve this question).

W yards = 3W feet
L yards = 3L feet

Surface of the room in square feet: 3W * 3L = 9WL.
Now, 10 cents per square foot means you're paying 9WL * 10 = 90WL cents for the entire room. However, the problem is asking for price in dollars. Since 1 dollar = 100 cents, 90WL cents will be 0.9WL dollars.

You are right about the conversion info, DanaJ. I must have had supplied that. I will take care of it in my future posts. You really are a careful, sincere, and responsible reader DanaJ. Am I using the synonyms of the same word (just to get you on verbal, kidding:-)? Thanks

The mind is everything. What you think you become. -Lord Buddha

Sanjeev K Saxena
Quantitative Instructor
The Princeton Review - Manya Abroad
Lucknow-226001

www.manyagroup.com

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Scott@TargetTestPrep: GMAT Instructor; Posts: 8157; Joined: Sat Apr 25, 2015 10:56 amFollowed by: 29 members; Location: Los Angeles, CA; Thanked: 43 times

by Scott@TargetTestPrep » Sun Aug 11, 2019 6:26 pm

sanju09 wrote:What is the cost in dollars to steam clean a room W yards wide and L yards long it the steam cleaners charge 10 cents per square foot?
A. 0.9 W L
B. 0.3 W L
C. 0.1 W L
D. 9 W L
E. 3 W L

OA A

The area of the room is 3W * 3L square feet. Notice that 10 cents is 1/10 of one dollar. Thus, the cost to clean the room is:

3W * 3L * 1/10 = 9WL/10 = 0.9LW

Answer: A

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