This question is on the ukmt junior maths challenge which I'm doing now, out of the options given I got 7, because 2+4+6+5+(5×20)+(7×7)= 166, (then dividing that by the number of numbers to get the mean) so 166÷31= 5.354.....
Formula for a circle: A=Pi*r^2 Diameter:2ft Radius:1ft A=3.14*1^2 A=3.14 Multiply by 4 4 squares=12.56ft squared Formula for a square: A=s^2 A=4^2 A= 16ft squared To find leftover you need to subtract 12.56 ft from 16 ft to get 3.44 ft squared(A).
