To find out how many truffles the chocolate maker can make, we first need to determine the total weight of the chocolate melted.
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Add the weights of the three blocks of chocolate: \[ 5.4 , \text{oz} + 6.1 , \text{oz} + 5.7 , \text{oz} \]
\[ = 17.2 , \text{oz} \]
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Since each truffle requires 0.4 oz of chocolate, we divide the total weight of the chocolate by the amount needed for each truffle: \[ \frac{17.2 , \text{oz}}{0.4 , \text{oz/truffle}} = 43 \]
Thus, the chocolate maker can make 43 truffles.