Toys to be placed on a shelf so that each shelf has same number of each type of toy. How many shelves are need for each type of toy so that it has the greatest number of toys?
Dolls 45
Footballs 105
Small cars 75

The area of a rectangle is 10 cm^2. one side of the rectangle is x cm. express the perimeter of the rectangle in terms of x and show that this rectangle cannot have a perimeter of 12 cm. the perimeter of the rectangle in terms of x is __ cm