Let's break down the problem step by step.
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Total Sandwich: Let's represent the total sandwich as 1 (or 100%).
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Amount eaten for lunch: Bishop ate \( \frac{1}{2} \) of the sandwich for lunch.
After lunch, the amount of sandwich left is: \[ 1 - \frac{1}{2} = \frac{1}{2} \]
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Amount eaten after work: After work, Bishop ate \( \frac{2}{3} \) of what was left. The amount left after lunch was \( \frac{1}{2} \).
To find out how much she ate after work: \[ \text{Amount eaten after work} = \frac{2}{3} \times \frac{1}{2} \] \[ = \frac{2 \times 1}{3 \times 2} = \frac{2}{6} = \frac{1}{3} \]
So, Bishop ate \( \frac{1}{3} \) of the sandwich after work.