Cindy buys a large pizza-with two toppings for $13.50. Lou buys three large pizzas with four toppings each at the same pizza parlour for $45. Find the cost of a large pizza and the cost per topping.

The perimeter of an equilateral triangle is 4 cm more than the perimeter of a square and the length of a side of the triangle is 8 cm more than the length of a side of the aware. find the length of a side of the equilateral triangle