Uncle Porter spent $15 at a book store. He bought science fiction and mystery novels. The science fiction novels cost $9 apiece and the mystery novels cost $2 apiece. If Uncle Porter bought 4 novels, how many of each type did he buy?

Svtturtles Aug 19, 2021

#1**0 **

Guess #1: 3 science fiction novels and 1 mystery novel

Find the number of books:

3 + 1 = 4

Find the total cost in dollars:

(9 × 3) + (2 × 1) = 27 + 2 = 29

The guess is incorrect. Try another guess.

Guess #2: 2 science fiction novels and 2 mystery novels

Find the number of books:

2 + 2 = 4

Find the total cost in dollars:

(9 × 2) + (2 × 2) = 18 + 4 = 22

The guess is incorrect. Try another guess.

Guess #3: 1 science fiction novel and 3 mystery novels

Find the number of books:

1 + 3 = 4

Find the total cost in dollars:

(9 × 1) + (2 × 3) = 9 + 6 = 15

The guess is correct. Uncle Porter bought 1 science fiction novel and 3 mystery novels.

DoctorOcopisMonOct Aug 19, 2021