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दूध व पानी का अनुपात ` 7 : 5` है। यदि 15 लीटर पानी और मिलाया जाए तो अनुपात `7 : 8` हो जाता है। तो नए मिश्रण में पानी की कुल मात्रा ज्ञात करे।
A. 35 litres
B. 40 litres
C. 60 litres
D. 96 litres

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Best answer
Correct Answer - B
`{:("Milk",:,,"water"),("Initial",7,:,5),("final",7,:,8):}`
Adding 15 litre water (15 लीटर पानी मिलाने पर)
`(7x)/(5x+15)=(7)/(8)`
`8x=5x+15`
`x=(15)/(3)`
`x=5`
`:.` At present (वर्तमान में) = milk : water = 7x : 8x
water `=8x =8 xx 5 = 40` litr

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