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.