Charlie makes 8 kilograms of dough every hour. If he works for 4 hours preparing the dough, then Charlie would have prepared 32 kilograms of dough.
So you have 8 kilograms every hour.
8:1
There are 4 hours that Charlie works on preparing dough. That would be 1 times 4. What you do to one side, you must do to the other.
8 times 4 is 32.
So Charlie has the ratio of 32:4.
Charlie makes 32 kilograms.