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JAMB 2003 · UME · Q2

A cinema hall contains a certain number of people. If 2212%22\frac12\% are children, 4712%47\frac12\% are men and 84 are women, find the number of men in the hall.

Worked solution (try it first)
  1. Children and men make up 2212%+4712%=70%22\frac12\% + 47\frac12\% = 70\%, so the 84 women are the other 30%30\%.
  2. So the hall holds 84÷0.3=28084 \div 0.3 = 280 people.
  3. Men are 4712%47\frac12\% of 280: 0.475×280=1330.475 \times 280 = 133, option A.

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