Question
221, 100, 0, -81,
? What should come in place of question mark (?) in the following number series?Solution
221 221 - 11² = 221 – 121 = 100 100 - 10² = 100 – 100 = 0 0 - 9² = – 81 -81 - 8² = 81 – 64 = - 145
30 workers working 8 hours daily can finish a job in 20 days. Find the time needed by 20 workers working 12 hours daily to finish the same job.
A’ and ‘B’ together can complete a work in 20 days while ‘A’ takes 30 days to complete the same work alone. If ‘C’ is 60% more efficient t...
Anupam requires 30% more time than Aman to complete a certain task. If both of them work together and earn a total of Rs. 23,000, determine Anupam's sha...
24 delivery boys can complete a delivery in 15 days. If 12 boys start the same work, and after 12 days, 'd' more boys join the work, completing the rema...
(x + 8) men working 9 hours a day can complete 60% of a work in 12 days. (x + 2) men working 3 hours a day can complete the remaining work in 32 days. F...
Komal and Seema individually can complete a task in ‘4a’ hours and ‘8a’ hours respectively. If they together can complete half of the work in 8 ...
A 40 hectare field is reaped by 4 men, 6 women and 8 children together in 10 days. If working capabilities of a Man, a Woman and a Child are in the rati...
Aman, Arun and Abraham can complete a work in 12, 20 and 24 days respectively. They all start working together. Aman left the work 1 day before its comp...
Rohit and Karan can complete a work alone in 64 days and 80 days respectively. Working together they earn Rs. 7,200. How much does Karan get?
Efficiency of a man is 25% more than that of a woman. (n + 4) men working 8 hours a day can complete a task in 20 days, whereas (2n - 4) women working ...
Relevant for Exams:
