Tomas found a bag of 100 AA batteries. Tomas found that only 3 out of 20 batteries were good. Based on
Tomas' attempts results so far, how many of the batteries in the bag could he expect to be good?
we know that
total AA batteries ------> 100
only 3 out of 20 batteries were good.
Applying proportion
3/20=x/100
solve for x
x=3*100/20
x=15
answer is 15 batteries