Answer:
Chelsea has 55 brushes
Step-by-step explanation:
If there are 60 brushes we know that Chelsea and Monique cant have more then 60 so you can look at you 11's 6 · 11 is 66 so we have to go lower 5 · 11 is 55 which might work so if Monique was to have 5 brushes then 11 times that would be 55 and 55 + 5 = 60