4MA1/1F Nov 2021, Question 3: Calculating a Percentage of a Quantity
Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 1F (Foundation) · Calculator · 5 marks
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The question, in short
Use a bar chart comparing Susan's and Philip's daily text message counts over six days to answer questions and add Saturday data.
Summarised in our own words. Use the official paper for the exact wording and the diagram.
Part (a) · 1 mark
Identify which day Susan's bar is twice the height of Philip's bar.
- 1Inspect the bar chart for each day where Susan's bar is twice the height of Philip's.
- 2On Wednesday, Susan's bar corresponds to 40 messages, Philip's to 20.
- 340 is twice 20.
- 4Therefore, the day is Wednesday.
AnswerWednesday
Part (b) · 1 mark
Read off Philip's text message count for Sunday from the chart.
- 1Read Philip's bar height for Sunday from the chart.
- 2Philip's bar on Sunday reaches 55.
- 3So Philip sent 55 text messages on Sunday.
Answer55
Part (c) · 1 mark
Draw bars for Saturday showing Susan 15 and Philip 40 text messages.
- 1Read the scale on the vertical axis
- 2Draw Susan's Saturday bar up to 15
- 3Draw Philip's Saturday bar up to 40, shaded to match the key
AnswerOn Saturday, a Susan bar at 15 and a Philip bar at 40, shaded to match the key
Part (d) · 2 marks
Calculate 25% of 180 text messages.
- 125% of 180 = (25/100) × 180
- 2= 0.25 × 180
- 3= 45
Answer45
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