Search this site:

ACT: Questions

College & Grad School


Word of the Day
invariable
Definition: (adjective) not changing or subject to change.
Petersons.com
Add Word of the Day to your personalized My Yahoo! page:
Add to My Yahoo! View RSS Feed
About My Yahoo! and RSS »

Math Teaser
Problem
A group of 9 friends invest equally in a business opportunity that costs $20,000. If n more friends were to take part evenly in the investment...
Petersons.com

SAT* Tip of the Day
So What?
Math questions involving two equations and two unknowns can usually be combined into one equation with one unknown.
Petersons.com
Add SAT* Tip of the Day to your personalized My Yahoo! page:
Add to My Yahoo! View RSS Feed
About My Yahoo! and RSS »

  

ACT: Math Question #7

Skip to Question: 1 2 3 4 5 6 7 8 9 10  | Next Question


Question: A store displays all the AA batteries it has in a display case on a wall. The batteries can be displayed in three columns of equal height. The batteries can also be displayed in four, five, or six columns of equal height. What is the smallest number of batteries that the store can have?

Choices:
A. 15
B. 30
C. 60
D. 180
E. 360



The correct answer is C.

Since the batteries can be evenly divided by 3, 4, 5, and 6, the answer will be the least common multiple of these numbers. The quickest approach is to consider the choices from smallest to largest. 15 is not a multiple of 4 or 6, so (A) is no good. 30 isn't a multiple of 4, so (B) is incorrect. 60, however, is evenly divisible by all four numbers. This is the correct answer.
 
*Test names and other trademarks are the property of the respective trademark holders.
Copyright © 2007 Peterson's, a Nelnet company. Used under license. All rights reserved.
-