RRB Group D 22-Sep-2018 Shift 1 Solved Paper

Question : 20 of 100

Marks: +1, -0

The ratio of sand to gravel in a mixture is 17: 9 while that between gravel and cement is 6: 17 . What is the ratio of sand to cement in the mixture?

Solution:

{\text "Sand "}/{\text"Gravel "}={17}/{9} ; {\text " Gravel "}/{\text "Cement"}={6}/{17}

{\text "Sand"}/{\text "Cement "}={\text " Sand "}/{\text "Gravel "}×{\text "Gravel"}/{\text " Cement "}

={17}/{9} ×{6}/{17}={6}/{9}=2: 3

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