$$\left. \begin{array} { l } { 3 k g 250 g \times 4 } \\ { 4 k g 620 g \times 3 } \end{array} \right.$$
$12gg_{250}g_{620}k$
$$12gg_{250}g_{620}k$$
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$12gg_{250}k,\ 12gg_{620}k$
