Rate & Ratio

21.09.18
Learn : I am learning to understand rate & ratio

3 evidence / examples:

3 x ? = 180
I know that 3 x 6 = 18
I multiply the 6 from 10 which is 60
So that means 3 x 60 = 180

4 x ? = 320
4 x 8 = 32 
8 x 10 = 80
So that means 4 x 80 = 320

4 x ? = 280
4 x 7 = 28
7 x 10 = 70
So that means 4 x 70 = 280