The sixth graders at amanda's school voted on favorite desserts. 25% voted for brownies, 35% voted for cake, and 40% voted for ice cream. if 42 students voted for cake, how many 6th graders are at amanda's school?

35% of the students voted for cake, and there are 42 of them.
so the ratio is 42:35
put it into this to solve this, assume there are x students in the school.

42 students :35% = x students: 100%
42:35=x:100
42/35=x/100
cross multiply them
35x=4200
x=120

thus, 120 6th graders are at Amanda's School.