Demetrius's car gets 12 miles per gallon of gas. a) If Minneapolis is 60 miles away, how many gallons of gas are needed to get there and then home?
b) If gas is $2.86 per gallon, what is the total cost of the gas for the trip?

What can we do about it

38+105= 143, 39+104=143, and you will find then adding the numbers on opposite sides, moving inwards yields the answer 138 every time. because of this, you’re going to multiply 138 times the number of pairs, which is 34. therefore, 34*138= 4692(i’m sorry if it’s the wrong numbers, but it’s the right concept)