$$\frac { 4 } { 15 } \times ( \frac { 1 } { 4 } + \frac { 5 } { 6 } )$$
$\frac{13}{45}\approx 0.288888889$
$$\frac{4}{15}\left(\frac{3}{12}+\frac{10}{12}\right)$$
$$\frac{4}{15}\times \frac{3+10}{12}$$
$$\frac{4}{15}\times \frac{13}{12}$$
$$\frac{4\times 13}{15\times 12}$$
$$\frac{52}{180}$$
$$\frac{13}{45}$$
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$\frac{13}{3 ^ {2} \cdot 5} = 0.28888888888888886$
