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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 ><
- 8 years agoFavorite 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
- ☂雨後晴空☀Lv 78 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.