Question: in a certain boys camp , 20 % of the total boys are from school a and 30 % of those study science . if there are 56 boys in the camp that are from school a but do not study science then what is the total number of boys in the camp ?
A) 70
B)  400
C)  150
D)  35
E)  350
Correct answer: b
Grade: 8 | Topic: Statistics and Probability | Difficulty: Medium | Standard: 8.SP.A.1