It takes ali 30 minute to mark a paper. aslam only needs 25 minutes to mark a paper. if they both start marking papers at 11;00 am at what time they will finish marking at the same time
The annual incomes and expenditures of man and his wife are in the ratios of 5 : 3 and 3 : 1, respectively. It they decide to save equally and find a balance of Rs. 4000 at the end of year, their incomes were
The mean of 100 observations was calculated as 40. It was found later on that one of the observation was misread as 83 instead of 53. The correct mean is:
