problem:
A factory makes 80000 items in 5 weeks.
How many items could be made in 2 weeks ?
answer:
1. step: proportion
: 5 weeks – 80000 items
* 2 weeks – x items
2. step: which proportion?
↓ less weeks ↓ less items = directly proportional
3. step: formula
x = 80000 * 2
5
x = 32000 items
4. step: answer
32000 items could be produced.