Five pen cost $₹ 115$ . How much will $7$ pens cost?

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Solution

Given cost of $5$ pen $=$ $₹ 115$
By unitary method:
Divide both side by $5$
cost of $1$ pen $=$ $\frac{₹ 115}{5} = ₹ 23$
Multiply both side by $7$
cost of $7$ pen $=$ $₹ 23 \times 7 = ₹ 161$
Hence, $7$ pens will cost $₹ 161$

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