RRB RPF RPSF SI and CONS Model Papers 6 with solutions

Question : 70 of 120

Marks: +1, -0

The wheat sold by a grocer contains 10% low quality wheat. What quantity of good quality wheat should be added to 150 kg of wheat so that the percentage of low quality wheat becomes 5%?

150 kg
135 kg
50 kg
85 kg

Validate

Solution:

(1) 10% low quality in 150 kg means 15 kg of low quality and 135 kg of good wheat.
Let x kg of good wheat is added to attain ratio 5 : 95 of low and high quality wheat.
According to the question,

{15}/{135+x}= {5}/{95}= {1}/{19}

Therefore,

x = 150

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