89 would be the correct answer
3. Cost of each box = $84/12 = $7
4. Donation to each charity = $120/4 = $30
HOPE THIS WILL HELP YOU
Out of all the numbers from 1 to 80, there are (80-20)/(80) = 60/80 = 0.75
of them that are greater than 20 .
So every time you pick one at random, there a 75% chance that it will be
greater than 20.
If everything works out according to pefectly random probabilities, then
in 180 selections, 75% of them = (0.75 x 180) = <em>135 of the selections</em>
would be numbers greater than 20 .