If 20 percent of 3k is 6, what is 40 percent of k?

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Re: If 20 percent of 3k is 6, what is 40 percent of k?

by Scott@TargetTestPrep » Sun Oct 25, 2020 1:39 pm

BTGmoderatorLU wrote: ↑
Wed Oct 21, 2020 4:44 am
Source: Magoosh

If 20 percent of 3k is 6, what is 40 percent of k?

A. 4
B. 12
C. 24
D. 36
E. 72

The OA is A

Solution:

0.2 x 3k = 6

3k = 6/0.2

3k = 30

k = 10

So 40 percent of 10 is 0.4 x 10 = 4.

Alternate Solution:

If 20 percent of 3k is 6, then 20 percent of k is 6/3 = 2. Since 40 percent of k is twice 20 percent of k, 40 percent of k is 2 x 2 = 4.

Answer: A

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