Question

How much pure alcohol be added to 400 ml of a 15% solution to make it's strength 32%
%.
15 प्रतिशत घोल के 400 मिली, की स्ट्रैन्थ 32 प्रतिशत करने के लिए इसमें कितना शुद्ध अल्कोहोल मिलाना पड़ेगा?
25 paise coins is three​

Answer 1

Step-by-step explanation:

Volume of alcohol in 400 ml solution =0.15*400 ml

Volume of alcohol in 400 ml solution =60 ml

Volume of others liquid = 340 ml

Let x ml of alcohol is added to make it 32% strong

Then, volume of alcohol = 60+x ml

Volume of other liquid = 340 ml

Volume of solution = 400 + x ml

0.32*(400+x)=60+x

Or, 128+0.32x=60+ x

Or, 0.68 x = 68

Or, 68 x =6800

x=100

100 ml of alcohol must be added.