We know that James can bake 12 cookies in 15 minutes. So, we can multiply both amounts ( the amount of cookies and the minutes it takes) to solve this question. First, ask " How many 15 minutes are in 60 minutes?" Or, 15 multiplied by what makes 60? The answer to this is 4. 15 minutes x 4= 60 minutes. Now, all we have to do is multiply the other side by the same amount. 12 cookies x 4 =48 cookies. So, he bakes 48 cookies.
175 students walk to school. 7+5=12 and 420 divided by 12 is 35. I checked how I did it was correct because of 5*35+7*35=420. Then I found the product of 5*35 which is 175.
