https://preparationpoint.info/solved-past-papers-mcqs/ppsc-past-papers/ppsc-past-papers-2018/model-paper-91-assistant-in-agriculture-bs-16-2018-in-the-punjab-agriculture-department/there-are-1100-boys-and-900-girls-in-a-school-50-boys-and-40-girls-are-present-the-total-no-of-students-present/