Alana and petra go to a used book sale, where every book is the same price. alana buys 5 books and petra buys 4 books. they run into their friend angus, who really loves to read, and discover that he has bought 19 books. angus received a $10.00 discount, but he still spent $7.50 more than alana and petra combined. how much does one book cost?

Cost of one book is $1.75.

Step-by-step explanation:

Let the cost of one book is $x.

Alana and Petra brought 5 + 4 = 9 books together.

⇒ Cost of book brought by them together is $9x

Angus brought 19 books and he gets $10 discount.

⇒ He paid for book is $19x - 10

But also Angus spent $7.5 more than Alana and Petra

⇒ 19x - 10 = 9x + 7.5

⇒ 10x = 17.5

⇒ x = 1.75

Thus the Cost of one book is $1.75.

2.56 is the width of the garden

step-by-step explanation: