Working alone, it takes julia 16 hours to clean an attic. lea can clean the same attic in 15 hours. if they worked together how long would it take them?

How do you think we set this problem up?

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)