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Question 13b

Video explanation ↓

A stack of 10 identical pots were arranged as shown in Figure 1.Figure 2 shows the remaining pots after 3 pots were removed.What is the height of one pot? (3 marks)

Question 13b diagram

Answer: 26.7 cm

Workings

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red dots, we call it lids blue dots, we call it body

63cm = 10 lids + 2 body 59.4cm = 7 lids + 2 body

if we minus the 2 equations

63 - 59.4 = 3 lids

3 lids → 3.6 1 lid → 3.6 ÷ 3 = 1.2

1 pot → 1 lid + 1 body

7 lids → 7 x 1.2 = 8.4

7 lids + 2 body = 59.4

2 body = 59.4 - 8.4 = 51 1 body → 51 ÷ 2 = 25.5

pot → 1 body + 1 lid = 25.5 + 1.2 = 26.7 cm

Video explanations

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