$$\frac { 5 } { 7 } 2 \frac { 1 } { 3 } k g$$
$\frac{5gk}{3}$
$$\frac{5}{7}\times \frac{6+1}{3}kg$$
$$\frac{5}{7}\times \frac{7}{3}kg$$
$$\frac{5\times 7}{7\times 3}kg$$
$$\frac{5}{3}kg$$
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