Question

Karen has 4h storybooks. Karen's storybook collection is 2/3 of what Mary's collection is. How many storybooks do they have in all,

Answer 1

If half of Karen's collection (4) is 1/3 of Mary's, and half of Karen's collection is 2, then 2 x 3 is how many Mary has, right? Once you know how many books Mary has, you can add how many Karen has to get your answer.