Mr. Donald has $900 in ten, twenty, fifty and one hundred dollar bills. He has an equal number of each denomination of bill. How many total bills does Mr. Donald have?  Choose the correct answer
A) 10 B) 20 C) 30 D) 40 E) 50
Let the number of each type of bill = b
Then 10b + 20b + 50b + 100b = 900
180b = 900
b = 5
So: The total number of bills that Mr. Donald has = 4b = 20
Answer: 20
<result>B</result>
Mr. Donald has $900 in ten, twenty, fifty and one hundred dollar bills. He has an equal number of each denomination of bill. How many total bills does Mr. Donald have?