Question

80 litre mixture of milk and water contains 10% milk. How much million
litres) must be added to make water percentage in the mixture as 80%
दूध तथा पानी के 80 लीटर मिश्रण में 10% दूध है। मिश्रण में पानी के प्रतिशत को 80%बनाने
के लिए कितना दूध (लीटर म) मिलाना पड़ेगा?
10 August 2017 Evening Shift
[B]9
[A]8
IC)10​

Answer 1

C) 10

Step-by-step explanation:

INITIALLY:

milk(m)=8L

water(w)=72L

After adding xL milk

milk(m')=8+x

water(w)=72L

total=80+x

water percentage must be 80%

80=(72/(80+x))*100

Hence x=10L

Answer 2

Answer:

$》Answer《$

Step-by-step explanation:

mixture of water and milk= 80L

percentage of water = 10%

therefore

amount of water

$= 8 \times \dfrac{10}{100}$

= 8L

water should be added to make it 20% water,

Let amount of water added be 'x'

Now,

total mixture of water and milk= 80+x

amount of water added= 8+x

percentage of water in mixture=20%

Then,

$( \dfrac{(8 + x)}{(80 + x)} ) \times 100 = 20$

$40 + 5x = 80 + x$

$5x - x = 80 - 40$

$4x = 40$

$x = \dfrac{40}{4}$

$x = 20$

Therefore,

X = 20 litres.

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