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5. If the cost of 20 pens is Rs. 180, calculate the cost of 15 pens?

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To calculate the cost of 15 pens when the cost of 20 pens is known, you can use the concept of proportion. Let C20C20 be the cost of 20 pens, and C15C15 be the cost of 15 pens. The relationship is proportional, so we can set up a proportion: C2020=C=15C15 Given that C20=Rs.180C20=Rs.180, substitute...
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To calculate the cost of 15 pens when the cost of 20 pens is known, you can use the concept of proportion. Let C20C20 be the cost of 20 pens, and C15C15 be the cost of 15 pens. The relationship is proportional, so we can set up a proportion: C2020=C=15C15 Given that C20=Rs.180C20=Rs.180, substitute this value into the proportion: 18020=C=15C15 Now, solve for C15C15: C15=180×1520C15=20180×15 C15=270020C15=202700 C15=135C15=135 Therefore, the cost of 15 pens is Rs. 135. read less
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