Divide 11 by 15 until
11/15 as a decimal is 0.7'3' recurring '3'
It is: 11/15 = 0.73333 .... recurring 3
13 over 15 = 13 ÷ 15 = 0.866667
0.7333
0.733 . . .
15 over 45 into decimal = 0.3333
0.06666 repeating
0.733 . . .
.733333 repeating.
(4+11)/32 = 15/32 = 0.46875
You do absolutely NOTHING! 15 is already in decimal form.
11/15 = 0.73333 repeating