Multiple choice

On mixing two classes X and Y of students having average marks 25 and 40 respectively, the overall average obtained is 30. Find the ratio of the students in the classes A and B

  1. 2: 1

  2. 5: 8

  3. 5: 6

  4. 3: 4

  5. 1: 2
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A Correct answer
Explanation

Using allegation method: difference of class X from overall (40-30=10) and class Y from overall (30-25=5) gives ratio X:Y = 10:5 = 2:1. Note: Question says 'classes A and B' but means 'classes X and Y' based on context.

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