Question

At one point in 2011, there were approximately 2.1 billion internet users worldwide. If approximately 9/40 of the users lived in Europe, estimate the number of Internet users in Europe at this time.

Answer 1

Estimating the number of internet users in Europe by multiplying the ratio with the whole internet users
users in Europe = 9/40 × 2.1 billion
users in Europe = 9/40 × 2,100 million
users in Europe = (9 × 2,100)/40  million
users in Europe = 18,900/40 million
users in Europe = 472.5 million

The number of internet users in Europe is approximately 472.5 million at this time