Nina completed a third of her homework problems. But one-half of all the problems she solved had incorrect answers. If 7 of the problems she solved had correct answers, then how many problems are in her homework?
so what you would do is you do it backwards, 7x2 which is one half of her problems do that I'd solved and you get 14. now you times that by 3 and you get the final answer 14x3
