1) 180 kg of mixture of milk and water contains 5% water.How much more water should be added to it that water may be 10% in the mixture? A) 10 kg B) 15 kg C) 20 kg D) 12 kg Answer: Option AExplanation:quality of water $=\frac{180\times 5}{100}=9kg$ Quality of milk $=180-9=171kgg$ Let x kg water be added.then, $\frac{9+x}{180+x}\times 100=10$ $90+10x=180+x,x=10$ Hence, 10 kg of water should be added.
