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UGC-NET-Paper1

Maths

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How much water (free of cost) should be added to 18 litres of milk worth Rs 70 per litre so that the value of the mixture is Rs 60 per litre?

1. 2 litres
2. 3 litres
3. 4 litres
4. 5 litres

70 रुपये प्रति लीटर मूल्य के 18 लीटर दूध में कितना पानी (निःशुल्क) मिलाया जाए ताकि मिश्रण का मूल्य 60 रुपये प्रति लीटर हो जाए?

1. 2 लीटर
2. 3 लीटर
3. 4 लीटर
4. 5 लीटर

This Question came in

UGC-NET-Geography-12-December-2023-Shift-2-Q37

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Detailed Explanation & Answer

Given,
Total milk = 18 litres
Rate = 70 rs/lit.
Hence,
Total Cost = 70 x 18 = 1260

After mixing water,
Rate = 60 rs/lit.
Cost = 1260
Total Milk = Cost / rate = 1260/60 = 21

Difference in total milk before and after mixing water
21 - 18 = 3

दिया गया है,
कुल दूध = 18 लीटर
दर = 70 रुपये/लीटर
अतः,
कुल लागत = 70 x 18 = 1260

पानी मिलाने के बाद,
दर = 60 रुपये/लीटर
लागत = 1260
कुल दूध = लागत / दर = 1260/60 = 21

पानी मिलाने से पहले और बाद में कुल दूध में अंतर
21 - 18 = 3

The Correct Answer is 2

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