If 8 spiders make 8 webs in 8 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) 8  E) 3

Rationale: "let the required number days be x . less spiders , more days ( indirect proportion ) less webs , less days ( direct proportion ) spiders 1 : 8 webs 8 : 1 1 x 8 x x = 8 x 1 x 8 = > x = 8 answer is d"
Answer: D