railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) Quantitative Aptitude Ratio and Proportion Direct or Indirect Proportion
Gold is 12 times as heavy as aluminum and copper is 5 times as heavy as aluminum.In what ratio gold and copper should be mixed to get an alloy 8 times of aluminum.
1
2 : 1
2
3 : 4
3
1 : 2
4
4 : 3