63.

At a party, three friends, Ashley, Cole, and Lauren, shared a big tub of popcorn. Within 30 min, the tub was empty. Ashley ate 712 of the tub while Lauren ate only 16 of the tub. How much did Cole eat?

and how do I solve this

I assume you mean 7/12 and 1/6.

Add 7/12 and 1/6 to find the total amount eaten by Ashley and Lauren:

7/12 + 1/6 = 7/12 + 2/12 = 9/12 = 3/4

Ashley and Lauren ate 3/4 of the tub.

Cole ate the rest.

1 - 3/4 = 4/4 - 3/4 = 1/4

Cole ate 1/4 of the tub.

You have to combine Ashley and Lauren's servings to find the remainder for cole. To do that, you need a common denominator for the two fractions. 1/6 can be multiplied by 2 to get 2/12. Now you can add 7/12 and 2/12. You get 9/12. 12/12 - 9/12 is 3/12. When simplified the answer is 1/4!

I hope you understand!