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ANSWER:
7 rice balls
STEP-BY-STEP EXPLANATION:
We know that a rice ball can be made with 100 grams of rice, therefore if we have 700 grams of rice, we can know the amount of rice that we could make by means of the following proportion:
[tex]\begin{gathered} \frac{1}{100}=\frac{x}{700} \\ \text{ Solving for x:} \\ x=\frac{700\cdot1}{100} \\ x=7 \end{gathered}[/tex]Therefore, Justin can make a total of 7 rice balls.