Question

In a group 2/5 of all students are girls and 2/3 of girls scored above 90% marks in math. If 36 girls have scored above 90%. Then select the option that indicate the no. of students who are not girls.
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Answer 1

Answer:

81

Step-by-step explanation:

Let number of students be x

Number of girls = 2x/5

Number of boys = x-2x/5 = 3x/5

Girls who scored above 90% = 2/3 * 2x/5 = 4x/15 = 36

So, 4x = 15*36 = 540

=> x = 135

Therefore, number of boys = 3*135/5 = 81