Question

A 100 subabhul saplings cost Rs 90. Find the cost of 250 such saplings.

Answer 1

Given:
Cost of 100 subabhul saplings = Rs 90
Now, let the cost of 250 subabhul saplings be Rs x.
∴ Ratio of numbers of subabhul saplings = Ratio of their costs

$$\begin{gathered} \Rightarrow 100:250=90:x \\ =\frac{100}{250}=\frac{90}{x} \\ =\frac{100÷50}{250÷50}=\frac{90}{x} \\ =\frac{2}{5}=\frac{90}{x} \\ \mathrm{Now}, \\ 90=2\times 45 \\ \therefore x=5\times 45=225 \end{gathered}$$

Thus, the cost of 250 subabhul saplings is Rs 225.