You just add the values for volunteers that worked 16-20 hours and 21-25 hours which would be 50 + 10 = 60. So the total number of volunteers that workers more than 15 hours is 60.
12x-27=2x+12
10x-27=12
10x=39
x=3.9
Answer:
15.64 Step-by-step explanation: I used a calculator
I believe it's both a and b
