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The ratio of present ages of A and B is 4:5. After 5 years, the ratio becomes 5:6. What is A’s present age?
A15 years
B20 years
C25 years
D30 years
A man rows downstream at 18 km/h and upstream at 12 km/h. Find the speed of the man in still water.
A14 km/h
B15 km/h
C16 km/h
D17 km/h
Find the standard deviation of the numbers: 2, 4, 6, 8, 10.
A2.83
B3.16
C4.00
D8.00
If 8 men can build a wall in 12 days, how many men are required to build the same wall in 6 days?
A12
B14
C16
D18
If 15% of A is equal to 20% of B, then 25% of A is equal to what percent of B?
A30%
B33.33%
C35%
D40%
A train running at 54 km/h crosses a man walking in the same direction at 6 km/h in 15 seconds. Find the length of the train.
A150 m
B200 m
C225 m
D250 m
A single discount equivalent to three successive discounts of 10%, 20%, and 25% is:
A42%
B46%
C48%
D50%