Answer:
15
Step-by-step explanation:
30% of 50 is 15 beacuase 50 is 1/2 of 100, and of 100 students 30 would have submtted forms. 1/2 of 30 is 15 which s the number of students that turned n forms
48 ten units and 1 five unit.
10+8h=66
minus 10 both sides
8h=56
divide both sides by 8
h=7
worked 7 hours