a)
[tex] \frac{1}{4} + \frac{2}{5} + \frac{1}{5} = \frac{5}{20} + \frac{8}{20} + \frac{4}{20} = \frac{17}{20} [/tex]
b)
[tex] \frac{20}{20} - \frac{ 17 }{20} = \frac{3}{20} [/tex]
c)
[tex] \frac{1}{4} = \frac{5}{20} \\ \\ \frac{2}{5} = \frac{8}{20} \\ \\ \frac{1}{5} = \frac{4}{20} [/tex]
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d)
[tex] \frac{1}{4} + \frac{1}{5} = \frac{5}{20} + \frac{4}{20} = \frac{9}{20} \\ \\ \frac{2}{5} = \frac{8}{20} [/tex]
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