Approximately 294 billion emails were sent each day

Question

The number of spam messages was about 9 times the number of nonspam messages. How many of each type of messages were sent each day in 2010

Answer 1

S = 9M    spam = 9(messages)

 

S +M= 294,000,000,000

 

9M + M = 294,000,000,000

 

10M = 294,000,000,000

 

M = 294,000,000,000/10

 

M = 29,400,000,000 regular mail messages

 

S = 29,400,000,000(9) = 264,600,000,000 spam messages