CBSE Class 12 Math 2022 Term I Solved Paper

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Case Study
In a residential society comprising of 100 houses, there were 60 children between the ages of 10−15 years. They were inspired by their teachers to start composting to ensure that biodegradable waste is recycled. For this purpose, instead of each child doing it for only his/her house, children convinced the Residents welfare association to do it as a society initiative. For this they identified a square area in the local park. Local authorities charged amount of ₹50 per square metre for space so that there is no misuse of the space and Resident welfare association takes it seriously. Association hired a labourer for digging out 250m3 and he charged ₹400X (depth) )2. Association will like to have minimum cost.

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Question : 46
Total: 50
Let side of square plot is xm and its depth is h metres, then cost C for the pit is
‌ Explanation: ‌‌C=‌
250×50
h
+400×h2

⇒C=‌
12500
h
+400h2
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