You wonder how many cars are in your area. you call up the ford dealership and ask how many cars they sold. they report thry sold a total of 15,000 cars. you then take a lawn chair and camp out on a busy road and count cars. you count 1200 cars and note that 700 of them are fords. estimate the number of cars in your area

$9p + $1d < $30

Step-by-step explanation:

unit cost of pizza :          9 

unit cost of drinks :         1

total cost of set (p & d) 10

pizza = 9/10 x 30 = 27 total cost of pizza

drinks =1/10 x 30 =   3 total cost of drinks

27 ÷ 9 = 3 number of pizzas to order 

 3 ÷ 1 = 3 number of drinks to order

To check:

9p + 1d < 30

9(3) + 1(3) < 30

27 + 3 < 30

30 < 30