*The answer is A. 24.*
All you have to do is back solve. In other words, just plug your answer choices into the equation.
Answer:
361/900
Step-by-step explanation:

Time used for the call to Zurich: ($5-$1.25)/$0.25=15 minutes
15minutes+3minutes=18minutes
Time used for the call to London: ($7.25-$1.25)/$0.25=24 minutes
24minutes+3minutes=27minutes
Difference between the two calls:27-18=9minutes
Answer: 5$ in all
Step-by-step explanation:
I added 3 + 2 dollars in all
It is true. YOU'RE WELCOME :D