If 3 spiders make 3 webs in 3 days, then 1 spider will make 1 web in how many days?	Choose the correct choice from the following answers.
A) 7 B) 6 C) 5 D) 4 E) 3

Rationale: "let the required number days be x . less spiders , more days ( indirect proportion ) less webs , less days ( direct proportion ) spiders 1 : 3 webs 3 : 1 1 x 3 x x = 3 x 1 x 3 = > x = 3 answer is e"
Answer: E