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posted by Manasa Tuesday, November 30, 2010 at 11:59am.

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?

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

32 students in Sonia's class

Right.

Work backwards from four and use the halves.

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