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love history [14]
3 years ago
8

The books in a private library are classified as fiction and nonfiction. There are 400 books in the library. There are 40 more f

iction books than nonfiction books. Audrey randomly picks a book. A few minutes later, Ryan randomly picks one of the remaining books. What is the probability that both pick nonfiction books?

Mathematics
2 answers:
tigry1 [53]3 years ago
8 0
Start first by determining the number of books of each category. if x is the nbr. of nonfiction then x+40 is the nbr of fiction. x+x+40=400
so x=180 is the nbr. of nonfiction and 220 is the nbr of fiction.the probability would be 180/400×179/399 so 2nd option
BabaBlast [244]3 years ago
8 0

Answer:  Second option is correct.

Step-by-step explanation:

Let the number of fiction book be 'x'.

Let the number of non fiction book be 'y'.

Total number of books = 400

So, equation would be

x+y=400------------(1)

Since there are 40 more fiction books than non fiction books.

So, equation would be

x-y=40-------------(2)

From Eq(1) and Eq(2), we have

x+y=400\\\\x-y=40\\\\-----------------------------------\\\\2x=440\\\\x=\dfrac{440}{2}\\\\x=220

And we will find the value of y:

220+y=400\\\\y=400-220\\\\y=180

As we have given that Ryan randomly picks one book without replacing it he picks the another book.

Probability that both pick non fiction books would be

\dfrac{180}{400}\times \dfrac{179}{399}\\\\=0.20

Hence, Second option is correct.

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=================================================

Work Shown:

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