Answer

Correct Answer : b ) 500

Quick Approach:

Rule of Alligation: It states that when two similar types of quantities (like marks, ingredients, percentage, weight etc.) associated with two persons or ingredients are mixed together to obtain a mean combined quantity for those persons, then

Thus, using the rule of alligation

Ratio of boys and girls = 3 : 1

Hence, (B) is the correct answer.

Basic Approach:

Let the number of girls be x

Thus, number of boys will be 2000 – x

According to the question

Number of boys who pass = 72% of (2000 – x)

Number of girls who pass = 84% of x

Total number of students who pass = 75% of 2000

Thus,

Solving for x we get,

x = 500

Hence, (b) is the correct answer.

Such type of question is asked in exams like SSC CGL, SSC MTS, SSC CPO, SSC CHSL, RRB JE, RRB NTPC, RRB GROUP D, RRB OFFICER SCALE-I, IBPS PO, IBPS SO, RRB Office Assistant, IBPS Clerk, RBI Assistant, IBPS RRB OFFICER SCALE 2&3, etc.

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