Given that Ming invited 12 people to her chrismas party, with a total of 13 people at her party, and each person have each other person a present, to determine how many presents were given the following logical reasoning must be performed:
Given that there are 13 people at the party, and each of them will bring a gift, by mathematical logic there will be 13 gifts distributed in the party.
The answer is 17cm by 20cm. The original area is 460cm (20x23), minus 120cm gives a new area of 340cm. 20cm-3cm=17cm and 23cm-3cm=20cm 17cmx20cm = 340cm
