how many kilograms of butter of rs 140 per kg must be mixed with 20 kg of butter worth rs 150 per kg to produce a mixture worth

Question

3 years ago

13

rs 144 per kg. explain this

2 answers:

saw5 [17] · Answer 1 · 2022-08-23T12:57:07+03:00

saw5 [17]3 years ago

5 0

500.....................................................

Stolb23 [73] · Answer 2 · 2022-08-23T14:10:37+03:00

Answer:

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 30