If 6 spiders make 6 webs in 6 days, then 1 spider will make 1 web in how many days?  Choose the most appropriate option
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 : 6 webs 6 : 1 1 x 6 x x = 6 x 1 x 6 = > x = 6 answer is b"
Answer: B