Answer:
3 GB
Step-by-step explanation:
Cell phone plan cost $30 per month (unlimited call)
plus $10 per GB data used
Alejandro can afford $60 per month that means
he can only used 3 GB omly because
60-30=30 (30 for the unlimited calls)
10 for every GB data used
he has $30 more so that means he only could use 3GB data max