IBPS RRB PO Prelims 21 Aug 2022 Shift 2 Paper

In alloy A ratio of Iron and Zinc is 3 ∶ 1 and in alloy B the ratio is 3 ∶ 7. They are mixed together in the ratio of 2 ∶ x to make another alloy C. In alloy C ratio of Iron and Zinc becomes 3 ∶ 4. What is the value of x?