4024/11 Oct/Nov 2020, Question 6: Time Calculations
Cambridge O Level Mathematics 4024 · Paper 11 (Non-calculator) · Non-calculator · 3 marks
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The question, in short
Work with ages and time units: find a younger sibling's age in years and months, and reduce a ratio of two time lengths to a simple fraction.
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Part (a) · 1 mark
Given Mariah is 17 years 5 months, work out how old her brother is, knowing he is 20 months younger.
- 120 months = 1 year 8 months
- 217 years 5 months − 1 year 8 months = 15 years 9 months
Answer15 years 9 months
Part (b) · 2 marks
Express 48 minutes compared with 2 hours 18 minutes as a fraction, giving it in lowest terms.
- 12 hours 18 minutes = 138 minutes
- 248/138 (÷ 6)
- 3= 8/23
Answer8/23
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