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Let's solve question 18 from the image:

**Question 18:**  
A large vessel is full of oil. A smaller vessel can contain \(\frac{2}{25}\) of the amount of oil contained in the larger vessel. Oil is taken out from the larger vessel ten times by filling the smaller vessel. What fraction of oil is left in the larger vessel?

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### Solution:

1. The smaller vessel holds \(\frac{2}{25}\) of the oil from the larger vessel.
   
2. The smaller vessel is filled and removed 10 times, so the total amount of oil removed is:
   \[
   10 \times \frac{2}{25} = \frac{20}{25} = \frac{4}{5}.
   \]
   Therefore, \(\frac{4}{5}\) of the oil is removed from the larger vessel.

3. The remaining fraction of oil in the larger vessel is:
   \[
   1 - \frac{4}{5} = \frac{1}{5}.
   \]

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Thus, the fraction of oil left in the larger vessel is **\(\frac{1}{5}\)**.

Would you like more details, or do you have any other questions?

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Here are 5 related questions for further practice:
1. If the smaller vessel could hold \(\frac{1}{10}\) of the oil, how much oil would remain after 5 fillings?
2. What fraction of oil would be left if oil is removed 15 times instead of 10?
3. If the smaller vessel is filled 8 times, what fraction of the oil is removed?
4. If the large vessel originally contains 100 liters of oil, how much oil is left after 10 fillings of the smaller vessel?
5. What is the total volume of oil removed if the smaller vessel holds 5 liters and is filled 6 times?

**Tip:** Always simplify fractions whenever possible to make calculations easier!

A large vessel is full of oil. A smaller vessel can contain 2/25 of the amount of oil contained in the larger vessel. Oil is taken out from the larger vessel ten times by filling the smaller vessel. What fraction of oil is left in the larger vessel?

Learn how to solve a fraction problem where oil is removed from a larger vessel by filling a smaller vessel multiple times. Understand key concepts like fractions and subtraction of fractions, with a step-by-step solution. Suitable for students in Grades 5-7.

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