If  `p : q = 5 : 7 " and " p - q = - 4`, then find the value of ` (3p + 4q)`.
Channel: Doubtnut
Date: 2020-05-09

If  `p : q = 5 : 7 " and " p - q = - 4`, then find the value of ` (3p + 4q)`.