Hemi, Peter and Sami each have some money. The have an average of $12 each. If Hemi gets another 6 dollars, what is the new average of the three boys?
Solution:
If the three boys start with an average of $12 each then the total amount they have between them is $36 (3 x $12).
If Hemi gets an extra $6 then they now have a total of $42 ($36 + $6) between them, meaning that they have an average of $14 ($42 ÷ 3) each.