Try the following GMAT Problem Solving question that tests your understanding of the averages (arithmetic mean).

Question 38:

The Dunbar family consists of a mother, a father, and some children. The average age of the members of the family is $20$, the father is $48$ years old, and the average age of the mother and children is $16$. How many children are in the family?

1. $\quad 2$

2. $\quad 3$

3. $\quad 4$

4. $\quad 5$

5. $\quad 6$

 
The following GMAT data sufficiency question tests your understanding of properties of parabolas in the coordinate plane that are commonly tested on the GMAT.

Question 37:

Given $mn \neq 0$, does the parabola $y=x^2+2mx+n$ intersect the $x-$axis at two distinct points ?

1. (1) $n \lt 0$
2. (2) $m^2 \gt n$

1. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
2. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
3. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
4. EACH statement ALONE is sufficient.
5. Statements (1) and (2) TOGETHER are NOT sufficient.

 
Try the following GMAT Problem Solving question that tests your understanding of questions based on sets and categories.

Question 36:

At Company $X$, $44\%$ of the employees that own laptops don’t own a cellphone, and $30\%$ of the employees that own a cellphone don’t own a laptop. If the number of employees without laptops is $40\%$ less than the employees with laptops, then what percent of the company’s employees neither own a laptop nor a cellphone?

1. $\quad 17.5$
2. $\quad 22.5$
3. $\quad 24$
4. $\quad 26$
5. $\quad 28$

 
The following GMAT data sufficiency question tests your understanding of algebraic inequalities tested on the GMAT.

Question 35:

Given $y^2>1$, is $xy>0$ ?

1. (1) $\dfrac{x}{1 \; – \left(\dfrac{x-1}{x}\right) } > 1$
2. (2) $x^2+y^2=2xy$

1. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
2. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
3. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
4. EACH statement ALONE is sufficient.
5. Statements (1) and (2) TOGETHER are NOT sufficient.

 
Try the following GMAT Problem Solving question that tests your understanding of applying distance, time, and rate concepts tested on the GMAT.

Question 34:

Mr. Earl E. Bird gets up every day at $8:00$ AM to go to work. If he drives at an average speed of $40$ miles per hour, he will be late by $3$ minutes. If he drives at an average speed of $60$ miles per hour, he will be early by $3$ minutes. How many miles per hour does Mr. Bird need to drive to get to work exactly on time?

1. $\quad 45$
2. $\quad 48$
3. $\quad 50$
4. $\quad 55$
5. $\quad 58$