Answers

2014-12-27T00:41:11+05:30

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Let x kg of butter @Rs140/kg be added to 20kg of butter @Rs 150/kg
total price = 140×x + 150×20 = 140x + 3000

after mixing, (x+20) kg of butter is produced @Rs144/kg 
144×(x+20) = 140x+3000
⇒144x + 144×20 = 140x + 3000
⇒ 144x - 140x = 3000 - 144×20
⇒ 4x = 3000-2880 = 120
⇒ x = 120/4 = 30kg

So required answer is 30kg
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2014-12-27T16:51:55+05:30

This Is a Certified Answer

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Let the Qty of butter of Rs 140 be mixed= x kg
Cost of 20 kg butter= 140*x Rs
Total qty of butter= (x + 20) Kg
 Cost of ( x+ 20)kg  butter= (x+20)*144
ATQ        150*20 + x*140= (x+20)* 144
             ⇒  4x= 120
                     x=30
30 Kg of butter of Rs 140 is mixed.
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