Question

it takes 15 minutes to mix ingredients for lemon bars and 20 minutes to bake them if Kelly started at 6:40 what time were they done

Answer 1

So to find the answer, you would add 15 to 20 and get 35. Then you would add 35 to 6:40 to get 6:75, but to then find the time actually (6:75 isnt a time lol) you would subtract 60 from 75, because there are60 minutes in an hour. You would end up with 7:15.

Answer 2

It was 7:15 when she got done. Hope this helps you