In order to solve this you need to multiply 1.75 times 4 for the total amount of gallons used. That would equal 7. Since we need to find how much she has left, we need to subtract. 11-7=4.
4 gallons of gas will be left after 4 hours of driving.
So we solve for each 70% of 100=70 students who didn't buy lunch=100-70=30
some of the 70 left so that the students who bought lunch, are 60% of those who are left we know that the students who didn't buy lunch didn't change number so therefor 100% of students left-60%=40%= students that didn't buy lunch=30 so 40%=30 20%=15 100%=75 there were 75 students lfet in the cafeteria
