Question

Plz need asap!!!!!!!!!

Among the eighth-graders in Michael's school, 70% have siblings. The eighth-grade class in 5/6 the size of the seventh-grade class.
If 112 eighth-graders have have siblings, how many students are in the seventh grade?
A) 128
B) 134
C) 160
D) 192

Answer 1

OK so if 70% of students in 8th grade have siblings and 112 8th graders have siblings, then:

0.7(total 8th graders) = 112

total 8th graders = 112/0.7

total 8th graders = 160

And since the number of 8th graders is 5/6 the size of the 7th grade class:

5/6(7th grade class) = 160

5(7th grade class) = 960

7th grade class = 192.

The correct answer is D) 192.

Hope this helps

cheers,

Brian