Question

If 35% of 300 students have no siblings, how many students have siblings?

Answer 1

$students\ that\ have\ no\ siblings:\\ 35\%*300=\frac{35}{100}*300=105\\\\ students\ that\ have\ siblings:\\ 300-105=195\\\\ 195\ students\ have\ siblings.$

Answer 2

X 35%
----- -------
300 100

100x 10500
----- = -------
100 100

X=105

The answer is 105