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Question

Q79. 16 litres of kerosene is mixed with 5 litres of petrol. The price of kerosene is Rs. 12 per litre and the price of petrol is Rs. 33 per litre. The average price of the mixture per litre is:

Q79. 16 लीटर केरोसिन 5 लीटर पेट्रोल के साथ मिलाया जाता है। केरोसिन की कीमत 12 रुपये प्रति लीटर और पेट्रोल की कीमत 33 रु प्रति लिटर है । मिश्रण की औसत कीमत प्रति लीटर क्या होगी है:


A

(a) Rs. 15

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B

(b) Rs. 17

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C

(c) Rs. 23

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D

(d) Rs. 27

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Solution

The correct option is B

(b) Rs. 17


Explanation

Now divide the difference of 12 and 33 in the ratio of 5:16 (not in the ratio of 16 : 5)

Here, the difference of 33 and 12 = 21

Again on dividing 21 in the ratio of 5 : 16, we get the first part = 5 and second part = 16

So, the average price = 12+5= 17

Or = 33-16 = 17.

Explanation:

अब 5: 16 के अनुपात में 12 और 33 के अंतर को विभाजित करें (16: 5 के अनुपात में नहीं)

यहां, 33 और 12 = 21 का अंतर

5: 16 के अनुपात में 21 को विभाजित करने पर, हमें पहला भाग

= 5 और दूसरा भाग = 16 मिलता है

तो, औसत मूल्य = 12 + 5 = 17

या = 33-16 = 17.


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