Question : The ratio of A's age to B's age is $4:3$. A will be 26 years old after 6 years. The age of B now is:

Option 1: $19\frac{1}{2}$ years

Option 2: $12$ years

Option 3: $21$ years

Option 4: $15$ years

Question : There are 3 members in a family. The average age of the father and mother is 40 years. The average age of the father, mother, and daughter is 30 years. Find the age (in years) of the daughter.

Option 1: 6

Option 2: 12

Option 3: 10

Option 4: 8

Question : If $2x-\frac{2}{x}=1(x \neq 0)$, then the the value of $(x^3-\frac{1}{x^3})$ is:

Option 1: $\frac{13}{4}$

Option 2: $\frac{13}{8}$

Option 3: $\frac {17}{4}$

Option 4: $\frac{17}{8}$

Question : Direction: Joan's age is 42, and Kelvin's age is 26. How many years ago was Kelvin's age half of Joan's age?

Option 1: 6 years

Option 2: 4 years

Option 3: 10 years

Option 4: 8 years

Question : The average age of 7 students in a class is 28 years. The average age of the first three students is 30 years. The age of the fourth student is 4 years less than the age of the fifth student. The ages of the last two students are the same and are 5 more than the average age of the first three students. What is the average age of fourth and fifth students?

Option 1: 20 years

Option 2: 36 years

Option 3: 16 years

Option 4: 18 years