The mean age of 5 people in a room is 40 years. A person enters the room. The mean age is now 39. What is the age of the person who entered the room?

Find the area of the regular hexagon if a side is 20 cm.

What is the percentile for data value 6 in the following data set? 4 13 8 6 4 4 13 6 4 13 2 13 15 5 9 4 12 8 6 13 40 25 35 62

You have 12 balloons to blow up for your birthday party. you blow up 1/3, and your friend blows up 5 of them. what fraction of the baloons still need blowing up