Question

Need help ASAP!
I know I am dumb..
But..
3/7=?/28 What is the ? mark?

Answer 1

12

Explanation:

write it out:

3/7 x x/28

cross-multiply and solve:

3*28 and 7x

3 x 28 = 84

make an expression:

84 = 7x

solve the expression:

7x/7 = 1

84/7 = 12

x =12