Question

If 7 spiders make 7 webs in 7 days, then how many days are needed for 1 spider to make 1 web

• A. 1
• B. 7
• C. 3
• D. 14

Answer 1

The correct option is B 7

From given, we have,

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

$\begin{array}{cc}\left(spiders\right)& 7:1\\ \left(webs\right)& 1:7\end{array}\}$

$\Rightarrow 7\times 1\times 7=1\times 7\times x$

$\Rightarrow x=7$

Hence the number of days taken by one spider $=1$ day