13. Exercise problems IX

A cottage industry produces a certain number of toys in a day. The cost of production of each toy (in rupees) was found to be $55$ minus the number of toys produced in a day. On a particular day, the total cost of production was $Rs. 750$. Find out the number of toys produced on that day.

 

Number of toys $=$  or

 

[Note: Enter the answer in ascending order]