First, convert 3/5 to a percent by multiplying it by 20/20, getting 60/100, or 60%. Then, find 60% of 40 by multiplying 60 by 40 to get 2,400 and divide it by 100 to get 24, meaning Mark spend $24 on both books. Each of the books cost $12, as 24/2 is 12.
Equation: 
Since there aren't any like terms and it can't be factored, your answer would be:

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A=1/2 (b1+b 2)(h) is the area of a trapezoid
Answer: Option A
The median is the same as the _ Second quartile_.
Step-by-step explanation:
Given a series of data ordered from least to greatest, the median is the value that is in the center.
That is, the median represents the value that divides 50% of the data.
In the same way, the first quartile
is the value that divides 25% of the data and the third quartile
is the value that divides 75% of the data.
The second quartile
is the number that divides 50% of the data.
Then notice that the second quartile is equal to the median
Then te answer is the option A.