47 - 11.50 = $35.50 needs to be earned.
If she works 6 hours:
6.50 x 4 = 26
5.25 x 2 = 10.50
26 + 10.50 = $36.50 how much she would earn by working 6 hours.
when you add the amount of money she would earn for working 6 hours $36.50 plus the money she had already had saved up $11.50 the total amount of money she would have is $48.00
So, yes. She would be able to go on the field trip if she worked at both jobs to 6 hours.
