Answer:
108
Explanation:
So, to start, we can calculate the fuel used in March by using the following equation:
(40x240)/100
Which is 96. So the furnace burned 96 gallons of fuel in March and was left with 144 gallons. Now we need to find out how much of its remaining fuel it burned in April, so we use this:
(25x144)/100
Which is 36. So it burned another 36 gallons of fuel in April, leaving it with 108 gallons still in the tank.