[Enquiry Officer, 2018]
6. A pot is filled with alcohol. 80% of alcohol is replaced by the same quantity of water. This process is done three times. Then find the percentage of alcohol in this mixture of alcohol and water:
51.2%
29%
38%
49%
7. By selling a watch for Rs.495, a shopkeeper incurs a loss of 10%. Then, find the cost price of the watch for the shopkeeper.
Rs.545
Rs.550
Rs.555
Rs.565
8. Total number of students in a class is 95, if the total number of girls in the class is 45, then the ratio of total number of boys to total number of girls is:
9 : 10
7 : 8
10 : 9
9 : 11
9. If ratio of two numbers is 20 : 39 and there sum is 295, then these numbers are:
100, 195
150, 145
105, 190
110, 185
10. If the ratio between two numbers is 8:17, then what number should be subtracted to make this ratio 2 : 5 ?
2
4
5
3