Questions 1 to 5 carry 2 marks each. Show your working clearly and write your answers in the space provided. For questions which require units, give your answers in the units stated. The total mass of two boys was 72.9 kg. The difference between their mass was 9.3 kg. What was the mass of the lighter boy? Ans: ___ kg

Four operations on decimals and fractions中文
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Worked solution

1

1. Find the mass of the lighter boy using the sum and difference method

Mass of lighter boy=72.9−9.32\text{Mass of lighter boy} = \frac{72.9 - 9.3}{2}

2. Calculate the final value

63.62=31.8 kg\frac{63.6}{2} = 31.8 \text{ kg}

Answer

31.831.8

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