CAT Exam Category

99 1/7+99 2/7+.....+99 6/7=?

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CAT Other Question

30 workers can complete a job in 20 days. After how many days should 9 workers leave the job so that the work is completed in total 26 days:
A) 12
B) 10
C) 6
D) None of these
find the value of 21+22+.....+60,if 1+2+....+40=820