A spoonful of cream is taken from a cup of cream and put into a cup of coffee. The coffee is then stirred. Then a spoonful of this mixture is put into the cup of cream.
Is there now more cream in the coffee cup or more coffee in the cup of cream?
cup = x units
spoonfull = y units
lets say a cup is 90 units
and a spoonfull = 10 units
beginning:
cup of cream: 90 units cream
cup of coffee: 90 units coffee
take a spoofull from cream and add to coffee:
cup of cream: 80 units cream
cup of coffee: 90 units coffee 10 units cream
(the coffee is now 9 parts coffee and 1 part cream)
take a spoonfull of coffee and put it into cream:
cup of cream: 81 units cream 9 units coffee
cup of coffee: 81 units coffee 9 units cream
you can replace
cup size and spoofull size by any numbers and result with the same answer
using math
