The least number of significant figures in any number of the problem determines the number of significant figures in the answer.
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20.865
Because otherwise you are using figures which imply an accuracy that cannot be justified.
In the number 0.05, there are two significant figures. The zero before the decimal point is not considered significant as it is a leading zero. The significant figures in a number are the digits that carry meaning contributing to its precision.
A ruler or scale should not be read to less than the smallest graduation. In practice, in-between measurements can be estimated but they are not significant.
Basic sign is 'x' or 'X'. The proper sign for calculating is '*'. boswell1