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611.If 8 is 4% of k, what is k?
612.X sold a property for Rs. 96,000 to Y at a 20% profit. Y then sold the property to Z at a 20% loss. For how much did Z buy the property?
613.The average of 10 numbers was calculated as 48. It was later discovered that while calculating the average, one number, 82, was incorrectly entered as 28. What is the correct average of these numbers?
614.Six clerks can complete a piece of work in 15 hours. After working for 5 hours, 3 more clerks join them with the same efficiency. How much total time will be required to complete the work?
615.A number is decreased by 12% and then increased by 15%. What is the final value as a percentage of the original number?
616.A number is increased by 20%. By what percentage must the increased number be decreased to return to the original number?
617.The principal and operation accounts are in the ratio of 7:5. If Rs. 90,000 is transferred from the principal account to the operation account, the ratio becomes 5:4. What was the original amount in the principal account?
618.The average of 10 students is 80. The average becomes 85 after adding 5 more students. What is the total marks of the 5 new students?
619.What is 15% of 840?
620.The mean of six numbers is 18. If another number 25 is added to these six numbers, what will be the new mean?