To determine how much water was lost from the pool, we can subtract the amount of water left in the pool from the amount of water initially filled.
- The pool was initially filled to \( \frac{3}{4} \).
- After playing, the pool was \( \frac{1}{10} \) full.
Now we need to calculate:
\[ \text{Water lost} = \text{Initial amount} - \text{Remaining amount} = \frac{3}{4} - \frac{1}{10} \]
To perform this subtraction, we need a common denominator. The least common multiple of 4 and 10 is 20.
Now we convert both fractions:
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Convert \( \frac{3}{4} \) to a fraction with a denominator of 20: \[ \frac{3}{4} = \frac{3 \times 5}{4 \times 5} = \frac{15}{20} \]
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Convert \( \frac{1}{10} \) to a fraction with a denominator of 20: \[ \frac{1}{10} = \frac{1 \times 2}{10 \times 2} = \frac{2}{20} \]
Now we can subtract the two fractions:
\[ \frac{15}{20} - \frac{2}{20} = \frac{15 - 2}{20} = \frac{13}{20} \]
Thus, the amount of water lost from the pool is \( \frac{13}{20} \).