Question

In Albert's apartment complex, 1/10 of the apartments are one-bedroom apartments and 1/2 are two-bedroom apartments. What fraction of the apartments are either one- or two-bedroom apartments?

Answer 1

When the categories are mutually exclusive, their total number (or their total fraction) can be found by adding their numbers (or fractions).

1/10 + 1/2 = 0.1 + 0.5 = 0.6 = 3/5