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The mean of 5 numbers is 20. If one number 20 is excluded, what is the new mean of the remaining 4?
A15
B18
C20
D22
Pipe A fills a tank in 10 hours, Pipe B in 15 hours. How long to fill together?
A5 hours
B6 hours
C8 hours
D12 hours
Angle of a triangle are in ratio 1:2:3. What is the largest angle?
A60°
B90°
C100°
D120°
If today is Monday, what day will it be after 15 days?
AMonday
BTuesday
CWednesday
DSunday