If a 6-foot man has a shadow of 9 feet, how long a shadow would a 20-foot pole have?

Answer 1

9 shadow/ 6 object * 20 object

= (180/6) shadow

= 30 shadow

Answer 2

Looking at the question as a proportion would give shadow/object = shadow/obj then put in your numbers...
9feet/6feet = shadow/20
then multiply both sides by 20 to obtain what Damon said : )