Twelve books cost me $48. What would 13 books cost me?

Answer 1

#$52#

The problem tells you that #12# books cost #$48#, so you can start by figuring out how much would #1# book cost.

To do that, use the given ratio as a conversion factor to go from number of books to cost. You will end up with

#1 color(red)(cancel(color(black)("book"))) * overbrace( ($48)/(12color(red)(cancel(color(black)("books")))))^(color(blue)("given by the problem")) = $4#
You now converted the #$48:"12 books"# ratio to an equivalent #$4:"1 book"# ratio. Use this ratio to find the cost of #13# books
#13 color(red)(cancel(color(black)("books"))) * ($4)/(1color(red)(cancel(color(black)("book")))) = color(darkgreen)(ul(color(black)($52)))#

Notice that you don't have to use the simplified ratio here, you can work directly with the one given to you by the problem

#13 color(red)(cancel(color(black)("books"))) * ($48)/(12color(red)(cancel(color(black)("books")))) = 13/12 * $48 = color(darkgreen)(ul(color(black)($52)))#
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Answer 2

To find the cost of 13 books, you can use a proportion. Since 12 books cost $48, you can set up the proportion:

12 books / $48 = 13 books / x

Solving for x, where x represents the cost of 13 books:

x = (13 books * $48) / 12 books

x = $52

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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