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Because multiplying or dividing them by the same NON-ZERO number does not alter their ratio.
This is related to the fact that dividing by a number is the same as multiplying with the number's reciprocal.
it is the same as multiplying by 0.4
No. By definition, 20% is equal to 0.2. Multiplying a number by 0.2 is not equal to dividing it by four. Finding 25% of a number is equal to dividing that number by 4. Finding 20% of a number is equal to dividing that number by 5.
This is because dividing by a number is the same as multiplying by its reciprocal.