PPSC Personal Staff Officer (BS-17) S&GAD 2020, Maths MCQs, PPSC Solved Past Papers MCQsTwelve Children take sixteen days to complete a work which can be completed by 8 adults in 12 days. After working for 3 days, sixteen adults left and six adults and four children joined them. How many days will take to complete the remaining work?A. 3 days B. 6 days C. 8 days D. 9 days A baby Heart beat starts?Treatment through vaccination was founded by?
