Question

A cell phone carrier offers two plans for text messaging. Plan A costs $20 per month plus $0.05 per text. Plan B costs $10 per month plus $0.10 per text. For how many text messages per month are the plans the same cost?
20
30
200
300

Answer 1

Let n be the number of texts. Set costs equal:
20 + 0.05n = 10 + 0.10n
10 = 0.05n
n = 200

Answer: 200.