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29 December, 23:13

Like bought 15 boos six books each cost $7 four of the books each cost $5 the rest of the books each cost $3 how many do all the books cost in all

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  1. 30 December, 01:16
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    The total combined cost of 15 books is $77.

    Step-by-step explanation:

    Here, the total number of books purchased = 15

    The cost of books = $7 for 6 books

    So, the cost of six books = 6 x (cost of 1 book) = 6 x ($7) = $42

    ⇒Out of 15 books, the cost of 6 books = $42 ... (1)

    The cost of books = $5 for 4 books

    So, the cost offour books = 4 x (cost of 1 book) = 4 x ($5) = $20

    ⇒Out of 15 books, the cost of 4 books = $20 ... (2)

    Now, the left books are at cost $3 each book.

    The number of left books = 15 - (6+4) = 15 - 10 = 5

    So, the cost of books = $3 for 5 books

    So, the cost of five books = 5 x (cost of 1 book) = 5 x ($3) = $15

    ⇒Out of 15 books, the cost of 5 books = $15 ... (3)

    Now, to get the total price of 15 books add (1) + (2) + (3), we get:

    $42 + $20 + $15 = $77

    Hence, the total combined cost of 15 books is $77.
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