55% is a first division mark in hseb
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Not sure about the first part of the question, but when doing long division, the partial answer is multiplied by the divisor to get a product, which then is subtracted from the dividend, to see how much is left over.
(percentage)x(how much of the substance)+(percentage)x(how much of the substance)=(total percentage)(total of substance)
70 percentage three quarters of the world
8.8
20%.