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[ember tundra]

The value of 1 part of the ratio is 420/20=21. To find the number travelling by train, we need the value of 17 shares so we do 21x17=357

[toxic surge]

why do you do 420/20? ? @ember tundra

[eager bronze]

would it not be 20 + 17 then divide by 420

[outer musk]

bec 20 'units' of people = 420

so 420 / 20 = 1 unit = 21 people

17 'units' of people take train

so 17 x 21 = 357 people take the train

[heavy stone]

Basically what @outer musk and wag1kk said

@toxic surge