Applied Maths. Section B2Numbers, Quantification and Numerical Applications

The amount of water that must be added to 45 litres of pure milk at 2…

The amount of water that must be added to 45 litres of pure milk at $2\frac{1}{2}$ litres for ₹120 so as to have mixture worth ₹36 a litre is :

Answer & explanation

Correct answer: option 3

The correct answer is Option (3) → 15 litres

Initial Milk Quantity = $45 L$

Cost of Pure Milk = $₹48$

Desired cost of final mixture = $₹36/L$

$⇒\frac{45×48+x×0}{45+x}=36$

$⇒45×48=36×45+36x$

$⇒36x=2160-1620$

$⇒36x=540$

$⇒x=15L$