Help me on 14 and 15

Answer:
#14:He has enough gas because he has 3/4 and it is equivalent to 0.75 and 1/4 is equivalent to 0.25 if you add 0.25 twice you get 0.50 therefore you have 0.25 of gas left over
i hope this helps
Answer:
10/12 -8/12 this is like subtracting 10 -8 =2 you keep the denominator which is 12 and u end up with 2/12 simply and you get 1/6