Ning prepared 16 kilograms of dough after working 4 hours. How many hours did Ning work if he prepar

Ning prepared 16 kilograms of dough after working 4 hours. How many hours did Ning work if he prepared 28 kilograms of dough? Assume the relationship is directly proportional.

Set up a proportion of kilograms of dough to working hours. We have:
16/4 = 28/h where h is the number of hours worked.

Typing this in our proportion calculator, we get h = 7.