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Mathematics Past Questions

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4046

The weight of a day-old chick was measured to be 0.21g. If the actual weight of the chick is 0.18g, what was the percentage error in the measurement?

  • A. 15.5%
  • B. 18.2%
  • C. 14.8%
  • D. 16.7%
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4047

Evaluate \((\frac{6}{0.32} \div \frac{2}{0.084})^{-1}\) correct to 1 decimal place.

  • A. 1.3
  • B. 2.5
  • C. 4.6
  • D. 3.2
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4048

If 2\(^{x + y}\) = 16 and 4\(^{x - y} = \frac{1}{32}\), find the values of x and y.

  • A. x = \(\frac{3}{4}\), y = \(\frac{11}{4}\)
  • B. x = \(\frac{3}{4}\), y = \(\frac{13}{4}\)
  • C. x = \(\frac{2}{3}\), y = \(\frac{4}{5}\)
  • D. x = \(\frac{2}{3}\), y = \(\frac{13}{4}\)
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4049

Simplify \(\frac{0.0839 \times 6.381}{5.44}\) to 2 significant figures.

  • A. 0.2809
  • B. 2.51
  • C. 3.5
  • D. 0.098
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4050

Find the value of x and y in the simultaneous equation: 3x + y = 21; xy = 30

  • A. x = 3 or 7, y = 12 or 8
  • B. x = 6 or 1, y = 11 or 5
  • C. x = 2 or 5, y = 15 or 6
  • D. x = 1 or 5, y = 10 or 7
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