$$42 / 3 + 31 / 4$$
$\frac{87}{4}=21.75$
$$14+\frac{31}{4}$$
$$\frac{56}{4}+\frac{31}{4}$$
$$\frac{56+31}{4}$$
$$\frac{87}{4}$$
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$\frac{3 \cdot 29}{2 ^ {2}} = 21\frac{3}{4} = 21.75$
