Question

Suppose it takes Carly 3 hours to read 81 pages in her novel. The equation 81 3 = 243 x can be used to determine the number of hours, x, it will take her to read 243 pages. How many hours will it take Carly to read 243 pages? A) 6 hours B) 8 hours C) 9 hours D) 12 hours

Answer 1

C

Explanation:

Answer 2

C 9 hours

Explanation:

It takes Carly 3 hours to read 81 pages in her novel.

It takes Carly x hours to read 243 pages in her novel.

Write a proportion:

`(81)/(3)=(243)/(x)`

Solve it for x. Cross multiply:

`81\cdot x=243\cdot 3\\ \\81x=729\\ \\x=(729)/(81)\\ \\x=9`

It will take Carly 9 hours to read 243 pages.