Question

Half of the students in Sonia's class are girls. Half of the girls have brown hair. Half of the brown haired girls have brown eyes. There are 4 girls with brown hair and brown eyes. How many students are in Sonia's class?

Answer 1

(1/2)(1/2)(1/2)n = 4
1/8n = 4
n = 4 / (1/8)
n = 4 * (8/1)
n = ?

Answer 2

32 students in Sonia's class

Answer 3

Right.

Answer 4

Work backwards from four and use the halves.