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The average age of a family of 5 members is 20 years. The age of the youngest member is 4 years. What was the average age of the family at the birth of the youngest member?
A16 years
B18 years
C20 years
D22 years
How many terms are there in the sequence 5, 10, 15, …, 200?
A38
B39
C40
D41
A boat travels 24 km upstream and 36 km downstream in 6 hours. If the speed of the stream is 2 km/h, find the speed of the boat in still water.
A8 km/h
B10 km/h
C12 km/h
D14 km/h
If 16 men can complete a project in 15 days, how many men are needed to complete the project in 10 days?
A20
B22
C24
D26
The area of a square is equal to the area of a circle with radius 7 cm. Find the side of the square. (Use pi = 22/7)
A11 cm
B12.41 cm
C14 cm
D15.4 cm
A train 300 m long crosses a pole in 15 seconds. What is the speed of the train in km/h?
A60 km/h
B72 km/h
C80 km/h
D90 km/h
The HCF of two numbers is 16 and their product is 3072. What is their LCM?
A120
B160
C192
D240
The average age of 24 students and their teacher is 15 years. If the teacher’s age is excluded, the average age decreases by 1 year. What is the teacher’s age?
A38 years
B39 years
C40 years
D41 years