18. In an examination 60% of 250 candidates passed. If the number of successful candidates would be 70%, then find the additional number of students that would pass.
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18. In an examination 60% of 250 candidates passed. If the number of successful candidates would be 70%, then find the additional number of students that would pass.
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[tex]Candidate \: passed \\ \\ = 60 \: \% \: of \: 250 \\ \\ = \frac{60}{100} \times 250 \\ \\ = \frac{60}{{10\cancel{0}}} \times25 {\cancel{0}} \\ \\ = \frac{60 \times 25}{10} \\ \\ = \frac{{6\cancel{0}} \times 25}{{1\cancel{0}}} \\ \\ = 150[/tex]
[tex]Passed \: \\ \\ = 150\% \: of \: 70 \\ \\ = \frac{70}{150} \times 100 \\ \\ = \frac{{\cancel{7,000}}}{ {\cancel{150}}} \\ \\ = 46.67[/tex]
Answer:
Additional 36 students who passed..