RRB RPF RPSF SI and CONS Model Papers 6 with solutions

Question : 40 of 120

Marks: +1, -0

A vessel contains 60 litres of milk. Six litres of milk is taken out and six litres of water is added to the vessel. Again, six litres of milk from the vessel is withdrawn and six litres of water is added to the vessel. The ratio of milk and water in the resulting mixture in the vessel is

81 : 19
71 : 29
61 : 39
61 : 29

Validate

Solution:

(1)

\text"Milk left in vessel after 2 replace operations "/\text" Original quantity of milk at the beginning (a) "

=({a-b}/a)^n

\text" Milk left in vessel after 2 replace operations "/60

= ( {60-6}/{60} )^{2}= {486}/{114}=81 : 19

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