RRB RPF RPSF SI and CONS Model Papers 1 with solutions

Question : 6 of 120

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In a 30 litres mixture of water and milk, 50% is milk. How much pure milk need to be added to this mixture to make mixture 30% water?

Solution:

(d) 30 litres mixture contains 15 litres of water. When milk added to this, quantity of water will same in sance (i.e. 15

l

).
Let x

l

of pure milk to be added, then 30% of (30 + x) = 15 solve, x = 20

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