What’s the answer anyone know?

On an airplane there are two seats on the left side and three seats on the right side there are 90 seats o the right side of the plane

News cameras take an overhead picture of a crowd at an outdoor event journalist then count the total number of people in the picture and use the sample of estimate the total number of people in the crowd this process is an example of

Hiroaki wants to find 3 3/4 - 7/8 explain why he must rename 3 3/4 to do the subtraction.