If 4 spiders make 3 webs in 9 days, then how many days are needed for 1 spider to make 1 web?	Choose the correct choice:	A) 9	B) 12	C) 27	D) 24	E) 16
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)4:1   (webs) 1:9}::x:3   â‡’4Ã—1Ã—9=1Ã—3 Ã— x   â‡’x=12   Answer: Option 12
<result>B</result>
If 4 spiders make 3 webs in 9 days, then how many days are needed for 1 spider to make 1 web?