In Math camp 144 problems were solved in two days.
The number of problems solved on the second day is
80% of the amount of the problems solved during the
first day. How many problems were solved in the first
day?

80 questions.

Step-by-step explanation:

-Let X be the number of problems solved on day 1.

-Questions solved on day 2 are:

We know that the total number of questions solved is 144:

Hence, the number of questions solved on the first day is 80

6 on both sides and twelve on the top and the bottom

step-by-step explanation:

just sum

10 + 10 = 20