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Simplify \(7\frac{1}{2}-\left(2\frac{1}{2}+3\right)\div16\frac{1}{2}\)and correct your answer to the nearest whole number

Mathematics
WAEC 2004

Simplify \(7\frac{1}{2}-\left(2\frac{1}{2}+3\right)\div16\frac{1}{2}\)and correct your answer to the nearest whole number

  • A. 33
  • B. 8
  • C. 7
  • D. 0
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Correct Answer: Option C
Explanation

\(7\frac{1}{2}-\left(2\frac{1}{2}+3\right)\div16\frac{1}{2}; \frac{15}{2} - \left(\frac{5}{2}+\frac{3}{1}\right)\div \frac{33}{2}\\
\frac{15}{2} - \left(\frac{5+6}{2}\right)\div \frac{33}{2}; \frac{15}{2} - \frac{11}{2} \div \frac{33}{2}\\


\(\frac{11}{2}\) ÷ \(\frac{33}{2}\) = \(\frac{11}{2}\) * \(\frac{2}{33}\)

  = \(\frac{11}{33}\) or \(\frac{1}{3}\) (when simplified)

\(\frac{15}{2}\) - \(\frac{1}{3}\) = \(\frac{43}{6}\)

7.166

The nearest whole number is 7


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