This problem can be solved using proportions.
81 90
___ = ____
x 100
Cross-multiplication gives us
(81)(100) = 90x
8100 = 90x
____ ___
90 90
90 = x
The class consists of 90 students.
40
eighteen
30
5
48
60 x 70% = 60 x 0.7 = 42
30
Seven are jumping.
40 percent of 25 students is 10.
17.6 which is technically imposible
There are 8 boys and 12 girls and 8 students with glasses.
Only seven percent of students who apply to Princeton will be accepted. The students who are accepted to Princeton have graduated in the top ten percent of their class.