Each day she works on multiplication problems for 10 minutes and division for 50 minutes. In a day she studies a total of 60 minutes
For 20 days that means she will spend the following minutes studying
[tex]20\times60=1200\text{ minutes}[/tex]For multilication she will spend the following minutes studying
[tex]10\times20=200\text{ minutes}[/tex]For division she will spend the following minutes studying
[tex]50\times20=1000\text{ minutes}[/tex]