Problema Solution
3. Helen sold 29 houses one month and 15 houses the next month. How many houses must she sell her third month for her average to be at least 22 houses per month?
Answer provided by our tutors
You have to average the 3 monthes
(29+15+x) ÷ 3 = 22
Multiply both sides by 3, you get
(29 + 15 + x) = 66
(44 + x) = 66
subtract 44 from both sides
x = 22