Make 2 tasks on addition and subtraction of fractions with identical denominators

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the first task: at Nikita was 1/4 part of pie, and at Nikitin of dad was the pie rest. Pie the second task consisted of how many parts: there is a Circle divided into 50 parts. a half of these parts is painted over. how many parts remained colourless. to find the answer through fraction
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Answer add