A person starts his job with a certain monthly salary and
earns a fixed increment every year. If his salary was Rs.4500
after 4 years of service and Rs.5700 after 12 years of service, find his initial salary and the annual increment.
150 workers were engaged to finish a piece of work in a certain
number of days. Four workers stopped the second day, four more
workers dropped the third day and so on. It takes 8 more days to
finish the work now. Find the number of days in which the work
was completed
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Answer:3900
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