← Quantitative Aptitude

Average/Mixture — Questions with Solutions

1 solved Average/Mixture questions from Quantitative Aptitude, as asked in SSC CGL and other SSC exams. Read the answer and explanation below, then practise the full set in the practice section.

Practise this topic

Q1. The average marks (out of 100) of boys and girls in an examination are 75 and 80, respectively. If the average marks of all the students in that examination are 78. Find the ratio of the number of boys to the number of girls.

  1. A. 2:3
  2. B. 3:4
  3. C. 1:3
  4. D. 1:2

Solution

Using alligation: Ratio = (80 - 78) / (78 - 75) = 2 / 3. So, Boys:Girls = 2:3.