allery72 per cent of 25 students are interested in mathematics. How many are not interested?
A7
B18
C8
D6
Answer & Solution
Correct answer: A. 7
1. Students not interested = 100 - 72 = 28 per cent.
2. 28 per cent of 25 = (28/100) x 25.
3. = 7 students.
4. Check: 18 interested plus 7 not interested makes the full 25.
_Source: syllabus Maths Ch7 'Comparing Quantities', Exercise 7.1 Q3_
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