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200 लीटर दूघ व पानी के मिश्रण में दूध व पानी का अनुपात `17 : 3` है। यदि कुछ दूध और मिलाया जाए तो अनुपात `7:1` हो जाता है। तो मिलाए गए दूध की मात्रा बताए।
A. 20 litres
B. 40 litres
C. 60 litres
D. 80 litres

1 Answer

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Best answer
Correct Answer - B
`{:("milk",:,"water"),(17x,:,3x):}`
`17 x+3x =200` litre
`20x=200`
`x=10` litres
`:.` milk : water
`170 : 30`
After adding x litre of milk the ratio becomes (x लीटर दूध मिलाने के बाद नया अनुपात)
`{:("Milk",:,"water"),(7,:,1):}`
`:. (170+x)/(30)=(7)/(1)`
`=170+x=210`
`x=40`
Alternate
`{:(,"M",:,"W"),("Before",17,:,3),("After",7,:,1):}`
`because` Water is same in both conditions (दोनों स्त्रियों में पानी बराबर होगा)
(ऊपर दिए गए अनुपात में पानी कि मात्रा बराबर करने पर)
image
`17+3 = 20` units `rarr 200` ltr
1 unit `rarr` 10 ltr
4 unit `rarr` 40 ltr.

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