Total sweets = 405
Each child gets = \( \frac{405}{n} \) sweets
Given: Each child’s sweets = \( \tfrac{1}{5} \) of the number of children
⇒ \( \frac{405}{n} = \frac{n}{5} \)
Cross multiply:
\( 405 \times 5 = n^2 \)
⇒ \( n^2 = 2025 \)
⇒ \( n = \sqrt{2025} = 45 \)
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