Insect spraying

In 600 ml of spraying is 5 ml of an active ingredient. How much is it per miles?

Correct result:

p =  8.3333 ‰

Solution:

V1=5 ml V2=600 ml  p=1000⋅ V1V2=1000⋅ 5600=253=8.3333 ‰

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