Question

Every seventh-grade student at Martin Middle School takes one world language class.

One-tenth of the seventh-grade students take French. Eighteen seventh-grade students take French.

Which equation represents s, the total number of seventh-grade students at the middle school?
18= 0.1s
18=10/s
s/0.1=18
10s=18

Answer 1

18 students are 1/10 of the number of seventh graders
`s`


`18 = 0.1 s`

First choice.

Answer 2

Option (A) 18 = 0.1s

Explanation:

Every seventh-grade student at Martin Middle School takes one world language class.

Now we will form the equation as per statement of the question.

Let total students of seventh-grade = s

" one tenth of seventh grade students take French."

" Students who took French were 18."

So
`(1)/(10)` of s = 18

(0.1)s = 18

therefore, Option (A) 18 = 0.1s is the answer.