Question

5 books cost 21. what is cost of 7 of the same books? show working​

Answer 1

Answer:

$29.40

Explanation:

5 books cost $21. That means you have to divide 21 by 5 to find the price of one book, which is $4.20. Then you multiply 4.2 by 7 to find the price of 7 books. 7 x $4.20= $29.40