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Question
If 10 pens cost 60 rupees, what is the cost of 15 such pens?
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Solution
Let us suppose the cost of 15 pens is x rupees.
The number of pens and their cost vary in direct proportion. Let us express the ratios and obtain an equation.
∴ 10x = 900
∴ x = 90 (Dividing both side by 90)
Cost of 15 pens is 90.
The number of pens and their cost vary in direct proportion. Let us express the ratios and obtain an equation.
∴ 10x = 900
∴ x = 90 (Dividing both side by 90)
Cost of 15 pens is 90.
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