Five girls M, N, O, P and Q are standing in a row. P is on the right of Q. N is on the left of Q, but is on the right of M. P is on the left of O. Who is standing on the extreme right?
In a class Rajan got the 11th rank and he was 31st from the bottom of the list of boys passed. Three boys did not take the examination and one failed. What is the total strength of the class?
Total number of boys passed = 11 + 31-1=41
Now, total number of boys = 41 + 3 + 1 = 45
In a family, mother's age is twice that of daughter's age. Father is 10 years older than mother. Brother is 20 years younger than his mother and 5 years older than his sister. What is the age of the father?
Suppose the age of daughter is x years.
Age of brother = x + 5 years
Age of mother = 2x years
∴ 2x - 20 = x + 5
⇒ 2x - x = 5 + 20
⇒ x = 25 years
Age of mother = 2x = 2 × 25 = 50 years
Age of father = 50 + 10 = 60 years