A. 0.5
B. 0.19
C. 0.20
D. 0.06
Mathematics
A and B can do a piece of work in 12 days, B and C in 15 days, and C and A in 20 days. How many days will A, B, and C together take to finish the work?
A. 20 days
B. 17 days
C. All of these
D. 10 days
If 10 persons can do a job in 20 days then 20 persons with twice efficiency can do the same job in:
A. 10 days
B. 5 days
C. 3 days
D. None of these
A person bought an item for Rs. 2500 and sold it for 15% discount. What was the selling price after discount?
A. Rs. 2022
B. Rs. 2125
C. Rs. 2229
D. Rs. 2230
One-third of one-fourth of a number is 15, then three-tenth of that number is:
A. 45
B. None of these
C. 54
D. 40
An observer 1.6m tall is 20√3m away from a tower. The angle of elevation from his eye to the top of the tower is 30°. The height of the tower is:
A. 21.6 m
B. 24.71 m
C. 25.2 m
D. None of these