Answer:
45 nickels.
Explanation:
We have been given that Jeremy and Robin like to collect nickels. Jeremy has n nickels, and Robin has 55 nickels. Together they have a total of 100 nickels.
We can represent our given information in an equation as:
![n+55=100](https://img.qammunity.org/2020/formulas/mathematics/high-school/9dh0alzgjjvxpn7e9cm36qn9g3ykzti9vz.png)
![n+55-55=100-55](https://img.qammunity.org/2020/formulas/mathematics/high-school/nkq5guz19v0upk1q6l1oabr8kpwkpd61ct.png)
![n=45](https://img.qammunity.org/2020/formulas/mathematics/high-school/4kooodcvnkg6k626pad4v5dtu6ige94a2f.png)
Therefore, Jeremy has 45 nickels.