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Mei mei asked in 科學及數學數學 · 8 years ago

maths 一题(Ratio and rate)

It is given that the scale of a map is 2cm to 50 km.

If the actual distance between two cities is 210 km.

what is the distance between the cities on the map?

the answer is 8.4 cm.

but i need the steps.

thx a lot ><

2 Answers

Rating
  • 8 years ago
    Favorite Answer

    s1 Unit is cm , 2 : 5,000,000

    s2 210 km = 21,000,000 cm

    s3 2 : 5,000,000 = ans : 21,000,000

    s4 5,000,000 * ans = 5.000.000 ans

    s5 2 * 21,000,000 = 42,000,000

    s6 5,000,000 ans = 42,000,000

    s7 42,000,000 / 5,000,000 = ans

    s8 ans = 8.4cm

  • 8 years ago

    Let x cm be the distance between the cities on the map , then

    x : 210 = 2 : 50

    x / 210 = 1 / 25

    x = 210/25

    x = 8.4

    The distance between the cities on the map is 8.4 cm.

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