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Q.

If Subhash bought 17 registers for ₹ 340, then find the cost of 5 such registers.

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a

₹ 100

b

₹ 120

c

₹ 140

d

₹ 80

answer is A.

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Detailed Solution

Given the cost of 17 registers ₹ 340.
We need to find the cost of 5 such registers.
Assume that cost of 5 registers is y Rs.
Understand that cost of registers and the number of registers is a direct proportion and hence the ratio of cost and number will be constant.

k = \frac{cost of registers}{number of registers}

Substitute given the cost of 17 registers as 340 and cost of 5 registers as y and equate them to simplify.

\frac{y}{5} = \frac{340}{17}

\frac{y}{5} = 20

y = 20 \times 5

y = 100

Cost of 5 registers is Rs 100.
Hence, the correct option is 1.

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