Question

Fill in the blank in the given table

$$\begin{array}{ccccccccc}X& 100& 250& 200& 50& 125& 1000& 4& 40\\ Y& 20& 8& 10& 40& & 2& 500& 50\end{array}$$

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Answer 1

We see that the quantities X and Y are inversely proportional, as the corresponding values of X and Y are such that XY = constant.
Considering blank quantity as y, we have the following relation:
100$\times$20 = 125$\times$y
Therefore, y = 16.