A class has from 30 to 40 students. Each boy brings 15 chocolate bars for a Teacher's Day party. The chocolate bars are shared equally among the 20 girl students and their teacher with no left overs. Find the number of Ss and chocolate bars
15 = 3x5, 21 = 3x7. Total bars = 3 x 5 x 7 x b = 105, 210,... if 105 bars -> 7 boys; if 210 bars -> 14 boys. There should be 10-20 boys -> 14 boys -> 34 Ss