Question

2/5 + 5/3 = 4/5

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Answer 1

Answer:

$\frac{2}{5} + \frac{5}{3} = \frac{4}{5} \\ \\ = \geqslant \frac{6 + 25}{15} = \frac{4}{5} \\ \\ = \geqslant \frac{31}{15} = \frac{4}{5} \\ \\ = \geqslant \frac{31 \times 5}{4 \times 15} \\ \\ = \geqslant \frac{31 \times 1}{4 \times 3} \\ \\ = \geqslant \frac{31}{12}$