Answer :
Ok so if you add the two 1/4's you will find how much gas she needs total to complete the trip. So do 1/4 + 1/4 and get 1/2. Next you can see that 3/4 is larger than 1/2, so she has enough gas.
Hope that helps!
Hope that helps!
So add 1/4 + 1/4 = 2/4 now you need to subtract so take 3/4 - 2/4 = 1/4 still left in gas tank hope this helps