Tomas has  1/2  of a cup of flour, but knows that it is  1/3 of what he needs for his pancake recipe. how much flour does he need to make pancakes?

The answer is 3/2 because if you do 1/2 times three you will get the answer

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)