The circle graph below shows the nubmer of hours per week a college student spends studying each subject of a college core curriculum. approximately what percent of these hours is spent on art and math combined?

the complete question in the attached figure

we know that

Art--------------------- > spends studying 10 hr

Math--------------------> spends studying 9 hr

total hours in the graph=5+9+10+6+13=43 hours

then

if 43 hours----------------------- > represents 100%

(10+9) Mat+Art-------------------> X

X=19*100/43=44.19%

the answer is 44.19%

10% of increase is the final answer! : )