For this case we have, that the berries cost 3 dollars per pound.
If you have $ 20, we want to find the maximum amount (N) of berries that we can buy.
By multiplying the N pounds of berries by $ 3, the product should not exceed $ 20.
So:
![N * 3 \leq20](https://img.qammunity.org/2020/formulas/mathematics/middle-school/fpaxjn9qjipnfscx8tm16b6eh8omm22bn0.png)
Thus, the inequality is:
![N * 3 \leq20](https://img.qammunity.org/2020/formulas/mathematics/middle-school/fpaxjn9qjipnfscx8tm16b6eh8omm22bn0.png)
![N \leq \frac {20} {3}](https://img.qammunity.org/2020/formulas/mathematics/middle-school/pe0dpyhqnvm1ckgnm72fwceq2x60gnyxi5.png)
Answer:
![N \leq \frac {20} {3}](https://img.qammunity.org/2020/formulas/mathematics/middle-school/pe0dpyhqnvm1ckgnm72fwceq2x60gnyxi5.png)