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Find the value of t in the diagram above

Mathematics
WAEC 1992

Find the value of t in the diagram above

  • A. 5.6cm
  • B. 6.5cm
  • C. 6.6cm
  • D. 6.8cm
  • E. 7.0cm
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Correct Answer: Option A
Explanation

\(\frac{\text{t}}{t + 4}\) = \(\frac{7}{7 + 5}\)

\(\frac{\text{t}}{t + 4}\) = \(\frac{7}{12}\)

12t = 7t + 28

12t - 7t = 28

5t = 28

t = \(\frac{28}{5}\) = 5.6cm


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