Question

Mike had one hundred five dollars to spend on seven books. after buying them he had fourteen dollars. How much did each book cost?

Pls show work and check too.

Answer 1

Each book costs
`13` dollars.

Explanation:

Let
`b` be the cost, in dollars, of each book.

If you buy
`7` books, the total cost of books bought is
`7* b`. If you had
`105` dollars and used some of it to buy books, then your remaining money would be expressed as
`105 -7b`. It also told as that after Mike bought those
`7` books, he had
`14` dollars left. So,
`105 -7 * b = 14`.

Solving for
`b`:

`105 -7 * b = 14 \\ 105 - 7 * b -105 = 14 - 105 \\ - 7 * b = -91 \\ (-7 * b)/(-7) = (-91)/(-7) \\ b = 13`

Answer 2

Answer: 105 divided by 7 = 15 so each book was 15 dollars

Explanation: