Faye bought 3 pizzas. Each pizza has 10 slices in it. If 90% of the lunch was eaten, how many slices are left?
90% = 90/100 = 9/10
So, if 9 out of the 10 slices of a pizza were eaten, how many slices are left
from each pizza?
How many pizzas were there?
3pizzas * 10slices/pizza = 30 slices,
30 - -9*30 = 3 slices left.
To find out how many slices are left, we need to calculate 90% of the total number of slices in the pizzas and then subtract that from the total number of slices.
Step 1: Calculate the total number of slices:
Since each pizza has 10 slices and Faye bought 3 pizzas, the total number of slices is 10 slices/pizza * 3 pizzas = 30 slices.
Step 2: Calculate 90% of the total number of slices:
To find 90% of a number, multiply the number by 0.90. So, 90% of 30 slices is 30 slices * 0.90 = 27 slices.
Step 3: Calculate the number of slices left:
Subtract 27 slices (90% of the total slices) from the total slices (30 slices): 30 slices - 27 slices = 3 slices.
Therefore, there are 3 slices of pizza left.
To find out how many slices are left, we need to calculate the total number of slices first.
Faye bought 3 pizzas, and each pizza has 10 slices, so the total number of slices is 3 × 10 = 30.
If 90% of the lunch was eaten, we can find the number of slices that were eaten by calculating 90% of 30.
To calculate 90% of a number, multiply the number by 0.9.
So, 90% of 30 is 30 × 0.9 = 27.
Since 27 slices were eaten, to find out how many slices are left, we subtract the number of eaten slices from the total number of slices.
Therefore, the number of slices left is 30 - 27 = 3.