I need 120 to buy a product. Out of 7 people only 2 will buy. How many people do I need to speak with?
You can set up a proportion: number of people who buy total number of people who have to buy
------------------------------ = --------------------------------------------
number of people asked total number of people asked
2 / 7 = 120 / x
Cross-multiplying: 2 · x = 7 · 120 ---> 2x = 840 --> x = 420
You can set up a proportion: number of people who buy total number of people who have to buy
------------------------------ = --------------------------------------------
number of people asked total number of people asked
2 / 7 = 120 / x
Cross-multiplying: 2 · x = 7 · 120 ---> 2x = 840 --> x = 420