Cody has 7/8 pound of cheese. he uses 1/7 since there are 16 ounces in a pound how much is left

Step One
Find the fraction left.
Starting amount = 7/8 pound
Used amount = 1/7 of a pound.

The common denominator of these two fractions is 8 * 7 = 56

Amount left = amount started with - amount used
Amount left = 7/8 - 1/7
Amount left = 
Amount left =
Amount left = 41 / 56 pounds

Step Two
Convert the Answer to ounces.

Ounces = (41/56) * 16 
Ounces = 11.71 ounces  almost 11 3/4

20000 as first it increases by 2500 then by 5000 so next it will increase by 10000