To find out how many cups of melon Janet puts in the salad, we need to add the two quantities of melon together: 3.25 cups of orange melon and 2 2/3 cups of watermelon.
First, let's convert 2 2/3 cups into an improper fraction:
\[ 2 \frac{2}{3} = 2 + \frac{2}{3} = \frac{2 \times 3}{3} + \frac{2}{3} = \frac{6}{3} + \frac{2}{3} = \frac{8}{3} \]
Now, we have:
- Orange melon: \( 3.25 \) (which can be converted to a fraction as \( \frac{13}{4} \))
- Watermelon: \( \frac{8}{3} \)
Now we can add these two fractions together. To do this, we need a common denominator. The denominators are 4 and 3, and the least common multiple of 4 and 3 is 12.
Now, let's convert each fraction to have a denominator of 12:
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Convert \( \frac{13}{4} \) to twelfths: \[ \frac{13}{4} \times \frac{3}{3} = \frac{39}{12} \]
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Convert \( \frac{8}{3} \) to twelfths: \[ \frac{8}{3} \times \frac{4}{4} = \frac{32}{12} \]
Now, we can add the two fractions: \[ \frac{39}{12} + \frac{32}{12} = \frac{39 + 32}{12} = \frac{71}{12} \]
To convert \( \frac{71}{12} \) to a mixed number, we divide 71 by 12:
- \( 71 \div 12 = 5 \) with a remainder of \( 11 \).
So, \[ \frac{71}{12} = 5 \frac{11}{12} \]
Thus, the total number of cups of melon Janet puts in the salad is: \[ \boxed{5 \frac{11}{12}} \] cups.