Which of the following is an example of using unit ratemethod of solving proportions?
A)If 23= x15 ,find the cross products,30 = 3x,and then solve for x.x = 10.
B)Allison bought 3 pairs of socks for $12.To find out how much 10 pairs cost,find that $12 divided by 3 is $4 a pair,and multiply $4 by 10 for a total of $40.
C)A square with a length of 2 inches was enlarged by a scale factor of 4 and is now 8 inches long.
D)If 5 candy bars cost $4.50,then 10 would cost $9.(Because 5 × 2 = 10,multiply $4.50 by 2).

Question

Quizplus · Accepted Answer

Unit rate method involves finding the cost of a single unit and then multiplying by the desired number of units. Choice B demonstrates this method by finding the cost per pair of socks and then multiplying by the desired number of pairs. The other options involve using cross products or scale factors to solve proportions.

Which of the Following Is an Example of Using Unit