https://preparationpoint.info/solved-past-papers-mcqs/ppsc-past-papers/ppsc-past-papers-2018/excise-taxation-inspector-dg-khan-region-control/a-soap-factory-makes-600-units-in-9-days-with-help-of-20-machines-how-many-units-can-be-made-in-12-days-with-the-help-of-18-machines/