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Answer :
Maximum value of weight which can measure the given weight exact number of time = HCF of 75 g and 69 kg
Prime factorisations of 75 and 69 are
$$
\begin{array}{|l}
\llap{3~~~~} 75 \\ \hline
\llap{5~~~~} 25 \\ \hline
\llap{5~~~~} 5 \\ \hline
1
\end{array}
$$
$$
\begin{array}{|l}
\llap{3~~~~} 69 \\ \hline
\llap{23~~~~} 23 \\ \hline
1
\end{array}
$$
75 = 3×5×5
69 = 3× 23