Answer:
0.58
Explanation:
15 + 21 = 36
21 / 36 = 0.58
0.58
NOW SOMETIMES SOME SCHOOLWORK WILL WANT IT HAS A HIGHER DECIMAL IT DEPENDS ON UR SCHOOL SO IF 0.58 DOES END UP BEING WRONG (which is unlikely because most schools would want it this way) THEN I WOULD DO 58.33
ok have a wonderful rest of ur day :)