If 7 spiders make 7 webs in 7 days, then how many days are needed for 1 spider to make 1 web? Pick one.
A) 1	B) 7	C) 3	D) 14	E) 16

Rationale: "explanation : let , 1 spider make 1 web in x days . more spiders , less days ( indirect proportion ) more webs , more days ( direct proportion ) hence we can write as ( spiders ) 7 : 1 ( webs ) 1 : 7 } : : x : 7 ⇒ 7 × 1 × 7 = 1 × 7 × x ⇒ x = 7 answer : option b"
Answer: B