Mr. white ordered pizza for the party. medium pizzas have 8 slices and large pizzas have 10. if there are 13 pizzas and 108 slices, how many medium pizzas are there?
Accepted Solution
A:
Let x and y be the number of medium and large pizzas respectively. Therefore, x+y = 13 ------- (1) 8x+10y = 108 ------- (2) -------------------------------- Solving (1) and (2)
From (1), x = 13 -y
Substituting in (2)
8(13-y)+10y = 108 104 - 8y +10 y =108 2y = 4 => y = 2 And then, x= 13-y => 13 - 2 = 11