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%