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In a class of 60, Sunita ranks 25th from top in maths and 30th from top in science. If 12 students score in both top-25 of maths and top-30 of science, how many are in only-maths-top-25?
A25
B13
C12
D20
Answer & Solution
Correct answer: B. 13
1. Top 25 in maths includes Sunita = 25 students total.
2. Of these 25, 12 are also in top-30 of science (overlap).
3. Students in only-maths-top-25 = 25 - 12.
4. = 13.
_Source: ICAI BoS Foundation Paper 3, Ch 11 'Seating', p.3_
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