11. A pizza parlor has four types of crust, 12 different toppings, and three different cheese blends to choose from. In how many ways could you order a three-topping pizza (one type of crust, three different toppings, and one cheese blend)

1320

Step-by-step explanation:

Given: In pizza parlor, Number of types of crust = 4

Number of types of different toppings = 12

Number of types of cheese blends = 3

Now, the number of ways to choose a pizza with one type of crust, three different toppings, and one cheese blend

=  

=

=

=

Hence, the required number of ways = 1320

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so: