If 10 spiders make 5 webs in 5 days, then how many days are needed for 1 spider to make 1 web?
Options
A) 10  B) 9  C) 5  D) 15  E) 20
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)10:1   (webs) 1:5}::x:5   â‡’10Ã—1Ã—5=1Ã—5 Ã— x   â‡’x=10   10nswer: Option 10
<result>A</result>
If 10 spiders make 5 webs in 5 days, then how many days are needed for 1 spider to make 1 web?