Question

filling the missind number:4/21 = ?/3 = 6/?​

Answer 1

$\huge{\tt\red{ANSWER}}\\\\\tt{let\:'x'\:and\:'y'\:be\:two\:unknown\:values.}\\\\\tt\frac{4}{21}\:=\:\frac{x}{3}\:=\:\frac{6}{y}\\\\\tt take\:first\:two\:pairs\:i.e.\:\frac{4}{21}\:=\:\frac{x}{3}\\\\\tt \frac{4}{21}\:=\:\frac{x}{3}\\\\\tt 4\:\times\:3\:=\:21x\\\\\tt \frac{12}{21}\:=\:x\\\\\tt Now \:take\:two\:pairs\:i.e.\:\frac{4}{21}\:=\:\frac{6}{y}\\\\\tt \frac{4}{21}\:=\:\frac{6}{y}\\\\\tt 4y\:=\:6\:\times\:21\\\\\tt y\:=\:\frac{126}{4}\\\\\tt y\:=\:\frac{63}{2}$