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Answer 1

$\frac{29}{10} - \frac{28}{15} \\ how \: to \: do \: that \: \\ just \: multipy \: 2 \times 10 = 20 \\ then \: add \: 9 \\ 20 + 9 = 29 \: like \: that \\ take \: lcm \: of \: 10 \: and \: 15 \\ 10 = 2 \times 5 \\ 15 = 3 \times 5 \\ lcm = 2 \times 3 \times 5 = 30 \\ so \: = \frac{29 \times 3 - 28 \times 2}{30} \\ \frac{87 - 56}{30} \\ = \frac{31}{30}$