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The average age of 5 members in a family is 25 years. If the youngest member is 5 years old, what was the average age of the family at the time of their birth?
A20 years
B22 years
C25 years
D27 years
The area of a circle is 616 cm². Find the radius.
A7 cm
B14 cm
C21 cm
D28 cm
A shopkeeper marks an item 20% above the cost price and allows a 10% discount. Find his profit percentage.
A8%
B10%
C12%
D15%
The average age of 10 students is 15. If the teacher is included, the average becomes 16. Find the teacher’s age.
A20
B25
C26
D30
If A and B can do a piece of work in 8 days and B alone can do it in 12 days, how long will A take?
A16 days
B20 days
C24 days
D30 days
A bag contains 6 red and 4 blue balls. If two balls are picked, what is the probability that both are red?
A1/3
B1/2
C1/4
D1/5
Simplify: (x^3 – y^3) / (x – y).
Ax^2 - y^2
Bx^2 + xy + y^2
Cx^2 - xy + y^2
Dx^2 + y^2