There are 38 parked cars in the parking structure. the parking structure is not full to capacity. there 13 parking spaces that are empty. what is the ratio of available parking spaces to parked cars.

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)