$$4 \frac { 1 } { 5 } \times 9 : 630 g$$
$\frac{3g}{50}$
$$\frac{\frac{20+1}{5}\times 9}{630}g$$
$$\frac{\frac{21}{5}\times 9}{630}g$$
$$\frac{\frac{21\times 9}{5}}{630}g$$
$$\frac{\frac{189}{5}}{630}g$$
$$\frac{189}{5\times 630}g$$
$$\frac{189}{3150}g$$
$$\frac{3}{50}g$$
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