CAT Practice : Percents, Profits

50% more than x is 1.5x. Simple, very useful idea.

Percentages - Classroom

    Q.9: Class B has 50% more students than class A. Number of girls in class A is equal to number of boys in class B. The percentage of girls is the same in both classes. What percentage of the student group are boys?
    1. 33.33%
    2. 40%
    3. 25%
    4. 60%


  • Correct Answer
    Choice B. 40%

Detailed Solution

Let number of girls in class A = x
Let number of boys in class A = y
Total number of students = x + y
Proportion of girls =

Number of boys in class B = x
Total number of students in class B = 1.5( x + y)
Proportion of girls =

Percentage of boys in the overall student community = * (x + y) * 100 = 40%. Choice (B)

Correct Answer: 40%

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