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2012
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Mathematics > Standard Multiple Choice
Read the following SAT test question and then click on a button to select your answer.
A geologist has 
rocks of equal weight. If 
rocks and a 
-ounce weight balance on a scale with 
rocks and a 
-ounce weight, what is the weight, in ounces, of one of these rocks?
Hint
If 
is the weight of one rock, then the weight of 
rocks and a 
-ounce weight can be written as 
, and the weight of 
rocks and a 
-ounce weight can be written as 
. Since the two sides balance, these weights are equal.
equal the weight of each rock, in ounces. The weight on one side of the scale is 
ounces and the weight on the other side is 
ounces. Since the two weights balance, you can write the equation 
