A data plan includes 15 GB per month. If 8 GB has been used, how much data remains?

A data plan includes 15 GB per month. If 8 GB has been used, how much data remains?

• A. 8 GB
• B. 7 GB
• C. 15 GB
• D. 0 GB

Answer: (B)

You’re testing subtraction of a remaining data amount from the monthly allowance. If a plan gives you 15 GB and you’ve already used 8 GB, the data left is 15 minus 8, which equals 7 GB. So 7 GB remains. The other numbers don’t fit because they correspond to different scenarios: 8 GB would imply a smaller total allowance, 15 GB would mean no data has been used, and 0 GB would mean all 15 GB have already been consumed.

You’re testing subtraction of a remaining data amount from the monthly allowance. If a plan gives you 15 GB and you’ve already used 8 GB, the data left is 15 minus 8, which equals 7 GB. So 7 GB remains.

The other numbers don’t fit because they correspond to different scenarios: 8 GB would imply a smaller total allowance, 15 GB would mean no data has been used, and 0 GB would mean all 15 GB have already been consumed.