Aubrey has a Shelf full of books exactly one third of books on the Shelf are Mysteries. Aubrey has read 10 of the mysteries on the shelf. the number of mysteries Aubrey has read is greater than 1/5 of the number of mysteries on the shelf and less than 1/4 of the number of mysteries on the shelf. what is the number of books on the shelf?

Question

Mathematics

Isaiah Nicholson

29 October, 20:19

Aubrey has a Shelf full of books exactly one third of books on the Shelf are Mysteries. Aubrey has read 10 of the mysteries on the shelf. the number of mysteries Aubrey has read is greater than 1/5 of the number of mysteries on the shelf and less than 1/4 of the number of mysteries on the shelf. what is the number of books on the shelf?

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Answers (1)

Know the Answer?

Josh Duffy · Answer 1

The correct answer for this question is this one: " 147"

Here's how to solve this problem.

Let x = number of mystery books on the shelf

Let 3x = total number of books on the shelf

we are told that

x/5<10
multiply by 20,

4x<200<5x

which means that

40
So the number of mystery books can be any number between 41 and 49.

In other words, the possible total number of books could be three times the above numbers, 123, 126, 129, ...

Choose the one that suits your answer choices.

Here are the following choices:

Which could be the number of books on the shelf?

A. 120 B 140 c 147 D 150