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If a – b = 5 and a + b = 15, find the value of a^2 – b^2.
A50
B75
C100
D125
A man is 24 years older than his son. In 2 years, his age will be twice the age of his son. Present age of son is:
A20 years
B22 years
C24 years
D26 years
If 8 men can complete a job in 12 days, how many days will 6 men take to finish the same job?
A14 days
B16 days
C18 days
D20 days
A tap fills a tank in 4 hours and a drain empties it in 6 hours. If both are open, how long to fill the empty tank?
A8 hours
B10 hours
C12 hours
D14 hours
A boat goes 12 km downstream in 2 hours and 12 km upstream in 3 hours. What is the speed of the current?
A1 km/h
B1.5 km/h
C2 km/h
D2.5 km/h
A train 200 m long running at 72 km/h passes a standing man in how many seconds?
A8 seconds
B10 seconds
C12 seconds
D15 seconds
Find the sum of the first 20 terms of the arithmetic progression: 3, 7, 11, 15, …
A780
B820
C860
D900
What is the probability of getting at least one head when two fair coins are tossed?
A1/4
B1/2
C3/4
D1
What is the 5th term of the geometric progression: 2, 6, 18, 54, …?
A108
B162
C216
D270
Find the area of a rhombus whose diagonals are 12 cm and 16 cm.
A48 cm²
B96 cm²
C192 cm²
D288 cm²