Given:
Total price of dinner = 48
They tipped the server 20 % of that amount.
To find:
The amount of tip.
Solution:
According to the question,
Amount of tip = 20 % of Total price of dinner
Total price of dinner = 48
Therefore, the amount of tip is 9.6.
3*3 + 3*3 = 9 + 9 = 18
You would use trial and error for this type of problem. Often parenthesis are involved to change the order of operations, but no parenthesis are needed here.