Mr. Green washed 1
4
of his laundry. His son washed
2
5
of it. How much of the laundry still needs to be washed?

(Need the answer to be in fractions)

What was the original number??

Step-by-step explanation:

take the logarithm of both sides (the base of the log doesn't matter):

apply the exponent property - this says that :

distribute the log terms on both sides:

group like terms together:

divide through both sides by the coefficient on :

you can do some additional rewriting here using the properties of the logarithm to simplify things if you like:

answer: it depends on what the tax percentage