Wahab wants to donate at least $\$6000$ in books and pairs of shoes.
Let $B$ represent the number of books and $S$ represent the number of pairs of shoes that Wahab must donate to achieve his goal.
$20B+50S \geq 6000$
**Wahab donates $100$ pairs of shoes. What is the least number of books he should donate to achieve his goal?**
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