1x + 3x = 240 => 4x = 240 => x = 60. Difference = 3x - 1x = 2x = 2 * 60 = 120.
1x + 3x = 240 => 4x = 240 => x = 60। अंतर = 3x - 1x = 2x = 2 * 60 = 120।