Three out of four students in a school said they would vote for nuncio for class president. Predict how many of the 340 students would vote for nuncio

3/4 = x / 340 ... 3 to 4 students = x to 340 students

cross multiply

(4) (x) = (3) (340)

4x = 1020

x = 1020/4

x = 255 <==

or this way ...

3 out of 4 students ... 3/4 = 75%

so 75% of 340 = 0.75 (340) = 255 <=