Solution:
we have been asked to find
The expression is equivalent to 
we can simplify the given expression as below

Hence the simplified expression , equaivalent to the given expression is 1/2.
Well if u divide 100 by 20 you'll get 5 groups of cookies and brownies
Well, company (A) has a deposit of $10
Company (B) has one of $20
subtraction property of equality