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Let’s go through each question in this worksheet step-by-step.

### Question 1
*Problem*: 
An aquarium has exhibits with different marine animals. \( \frac{5}{8} \) of the staff are male, and \( \frac{5}{12} \) of the staff works part-time at the aquarium. What fraction of the staff is female?

*Solution*:
1. Since \( \frac{5}{8} \) of the staff are male, the fraction of the staff that is female will be the remaining portion.
   \[
   1 - \frac{5}{8} = \frac{8}{8} - \frac{5}{8} = \frac{3}{8}
   \]
   Therefore, \( \frac{3}{8} \) of the staff is female.

The \( \frac{5}{12} \) fraction representing part-time staff is extra information for this question and is not necessary for finding the fraction of female staff.

**Answer for Question 1**: \( \frac{3}{8} \) of the staff is female.

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### Question 2
*Problem*: 
The sharks are fed three times a day. During the morning feeding, \( \frac{2}{15} \) of a ton of fish is fed. During the afternoon feeding, the weight of fish fed is \( \frac{1}{15} \) of a ton more than the fish fed in the morning. If the total weight of fish fed in a day is \( \frac{1}{2} \) of a ton, how much is fed during the feeding at night?

*Solution*:
1. **Morning Feeding**: \( \frac{2}{15} \) of a ton.
2. **Afternoon Feeding**: The afternoon feeding is \( \frac{1}{15} \) of a ton more than the morning feeding.
   \[
   \frac{2}{15} + \frac{1}{15} = \frac{3}{15} = \frac{1}{5}
   \]
   So, \( \frac{1}{5} \) of a ton is fed in the afternoon.
3. **Total Feeding in the Day**: The total feeding is \( \frac{1}{2} \) of a ton.
4. **Night Feeding Calculation**:
   Let \( x \) represent the amount fed at night. According to the total:
   \[
   \frac{2}{15} + \frac{1}{5} + x = \frac{1}{2}
   \]
5. **Simplify**: Convert \( \frac{1}{5} \) to a fraction with a denominator of 15 to make addition easier:
   \[
   \frac{1}{5} = \frac{3}{15}
   \]
   So,
   \[
   \frac{2}{15} + \frac{3}{15} + x = \frac{1}{2}
   \]
   Combine \( \frac{2}{15} \) and \( \frac{3}{15} \):
   \[
   \frac{5}{15} + x = \frac{1}{2}
   \]
   Simplify \( \frac{5}{15} \) to \( \frac{1}{3} \):
   \[
   \frac{1}{3} + x = \frac{1}{2}
   \]
6. **Solve for \( x \)**:
   Subtract \( \frac{1}{3} \) from both sides:
   \[
   x = \frac{1}{2} - \frac{1}{3}
   \]
   Find a common denominator (6):
   \[
   x = \frac{3}{6} - \frac{2}{6} = \frac{1}{6}
   \]
   So, \( \frac{1}{6} \) of a ton is fed at night.

**Answer for Question 2**: \( \frac{1}{6} \) of a ton is fed during the night feeding.

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Would you like a more detailed breakdown of any steps or have any questions?

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Here are some additional related questions:
1. If \( \frac{3}{4} \) of the staff worked full-time, what fraction would work part-time?
2. How much fish would be fed in total over a week if the daily total remains \( \frac{1}{2} \) ton?
3. If another aquarium feeds \( \frac{1}{3} \) ton of fish per day, how much more or less is fed daily compared to this aquarium?
4. What fraction of the staff would be female if \( \frac{3}{8} \) of them were part-time females?
5. If the aquarium's staff increased by 20%, what would the new fraction of male staff be, assuming the male-to-female ratio remains the same?

**Tip**: Always simplify fractions early in the process to make calculations easier and more manageable.

1. \(\frac{5}{8}\) of the staff are male. \(\frac{5}{12}\) of the staff works part-time at the aquarium. What fraction of the staff is female?

2. The sharks are fed three times a day. During the morning feeding, \(\frac{2}{15}\) of a ton of fish is fed. During the afternoon feeding, the weight of fish fed will be \(\frac{1}{15}\) of a ton more than the fish fed during the morning. If the total weight of fish fed in a day is \(\frac{1}{2}\) of a ton, how much is fed during the feeding at night?

Explore Grade 5 fraction word problems involving staff composition at an aquarium and shark feeding schedules. Learn to calculate the fraction of female staff and fish fed during different times of day using fraction addition and subtraction. Suitable for students mastering fractions.

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