Let h = the number of hours Marta works
Her savings in her account can be calculated by:
840 + 15h
This needs to be at least $2650 for her trip, so an inequality to solve:
840 + 15h ≥ 2650, where h is the number of hours worked
Now solve:
15h ≥ 1810
h ≥ 1810/15
h ≥ 
Marta needs to work at least
hours in order to have enough money for her trip.
The answer is inconsistent