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Question 69
75% of the students passed in an examination. If 2 more students had passed the examination, 80% would have been successful. How many students are there in the class?
Solution
$$5\ \%\ \longrightarrow\ 2$$
$$1\%\ \longrightarrow\ \ \frac{\ 2}{5\ \%\ }$$
$$100\%\ \longrightarrow\ \ \frac{\ 2}{5\ \%\ }\times\ 100\ \%\ =40$$
Hence option 'A' is correct.
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