steam clean a room

[sanju09]

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

[DanaJ]

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.

[sanju09]

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

[Scott@TargetTestPrep]

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