Each of 74 students in a class studies | Quantitative Aptitude
Modern Maths | Set Theory
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The question below is from previous year CAT question from CAT 2018 exam comes from CAT Set Theory: Each of 74 students in a class studies. Find out by answering this question which tests an aspirant’s Quantitative Ability Skills:
CAT 2018 - Slot-1 - Modern Maths - Question-3 - Each of 74 students in a class studies
Q. 3: Each of 74 students in a class studies at least one of the three subjects H, E and P. Ten students study all three subjects, while twenty study H and E, but not P. Every student who studies P also studies H or E or both. If the number of students studying H equals that studying E, then the number of students studying H is
Let the number of students who studying only H be h, only E be e, only H and P but not E be x, only E and P but not H be y
Given only P = 0 All three = 10; Studying only H and E but not P = 20 Given number of students studying H = Number of students studying E
= h + x + 20 + 10
= e + y + 20 + 10
h + x = e + y total number of students = 74 Therefore, h + x + 20 + 10 + e + y = 74
h + x + e + y = 44 h + x + h + x = 44 h + x = 22
Therefore, the number of students studying H = h + x + 20 + 10 = 22 + 20 + 10 = 52.
Past Year Question Paper & Solutions
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