Question

दूध और पानी के 70 लीटर मिश्रण में 10% पानी है। इसमें कितना पानी और मिलाया जाए कि नये मिश्रण में पानी की मात्रा 37% हो जाए?

Answer 1

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Answer 2

Answer:

30

Explanation:

We need 37% Water in New Mixture after adding more water so ,

Let we will add x Liter of more water then »»»

Water which is already in mixture is 70 × 10/100 = 7 Liter

So if we add more water in 7 liter then it will become 37% of water in new mixture .

»»» .i.e.

» 37 = [ (7 + x ) / (70 + x) ] × 100

» 37 / 100 = [ (7 + x ) / ( 70 + x ) ]

» 37 (70 + x) = 100 ( 7 + x)

» 2590 + 37 x = 700 + 100 x

solving this answer

x = 30.

Or you can understand it as :

>> Method 2 :

(70 + x) × 37% = 70 × 10% + x

Solving this

x = 30.