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17 (a) The scale of a map is 1 cm represents 25 m - OCR - GCSE Maths - Question 18 - 2017 - Paper 1

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17 (a) The scale of a map is 1 cm represents 25 m. (i) The length of a path is 240 m. Work out the length, in centimetres, of the path on the map. (ii) The scale ... show full transcript

Worked Solution & Example Answer:17 (a) The scale of a map is 1 cm represents 25 m - OCR - GCSE Maths - Question 18 - 2017 - Paper 1

Step 1

(a)(i) Work out the length, in centimetres, of the path on the map.

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Answer

To determine the length of the path on the map in centimeters, use the scale given, which states that 1 cm represents 25 m.

  1. First, convert the actual length of the path from meters to centimeters. Since 1 m equals 100 cm, we have:

    240extm=240×100=24000 cm240 ext{ m} = 240 \times 100 = 24000 \text{ cm}

  2. Next, using the scale, we can find the length on the map as follows:

    Length on map (cm)=Actual Length (cm)Scale factor (cm/m)\text{Length on map (cm)} = \frac{\text{Actual Length (cm)}}{\text{Scale factor (cm/m)}}

    In this case, the scale factor of 25 m corresponds to 1 cm. Therefore, we can write:

    Length on map (cm)=24000 cm25=960 cm\text{Length on map (cm)} = \frac{24000 \text{ cm}}{25} = 960 \text{ cm}

Step 2

(a)(ii) Find the value of k.

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Answer

To express the scale 1 cm represents 25 m in the form of 1:k, we can set up the relationship:

  1. Since 1 cm corresponds to 25 m, we can say:

    1:k=1:251 : k = 1 : 25

  2. From this, we can deduce that:

    k=25k = 25

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