Please give answer of 7 and 8

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Please find similar query below:

8.

Fraction of wall painted by Lillian = \frac{7}{10} Fraction of wall painted by Champa = \frac{1}{5} Now, Fraction of wall painted by both of them = \frac{7}{10} + \frac{1}{5} = \frac{7 + 2}{10} = \frac{9}{10}

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