GMAT: Data sufficiency 18 | Data sufficiency | GMAT | Khan Academy

TL;DR

This video provides solutions to GMAT problem-solving questions, including topics like inequalities, probability, and linear equations.

Transcript

We're on problem 80. If a, b, and c are integers, is a minus b, plus c greater-- OK. So what they want to know is a minus b, plus c greater than a plus b, minus c? Fair enough. And if you think about it, there's an a on both sides of this equation. So what they're really wanting to know is minus b plus c greater than b minus c? Or another way, they... Read More

Key Insights

• 😑 Rearranging expressions and comparing values of integers can determine if one expression is greater than another.
• 🖼️ The duration of an animated cartoon can be calculated by dividing the total frames by the frames per second and then dividing by 60 for minutes.
• #️⃣ Calculating probabilities involves dividing the number of desired outcomes by the total number of possible outcomes.

Questions & Answers

Q: How do you determine if an expression is greater than another expression using integers?

By rearranging the expressions and comparing the values of the integers, it is possible to determine if one expression is greater than the other. The video provides step-by-step explanations for solving this type of problem.

Q: How can you calculate the duration of an animated cartoon given the number of frames per second?

Divide the total number of frames by the frames per second to calculate the duration in seconds. Then divide by 60 to find the duration in minutes.

Q: How can you calculate the probability of selecting a specific color chip from a box?

Divide the number of chips of the desired color by the total number of chips in the box to find the probability.

Q: How can linear equations be used to find a value on a number line?

By establishing a relation between two points on the number line, it is possible to write a linear equation and solve for the desired value.

Summary & Key Takeaways

• The video discusses a problem involving inequalities and discusses how to determine if an expression is greater than another expression using integer values.

• Another problem involves calculating the duration of an animated cartoon given the number of frames per second.

• The video also addresses a probability question related to selecting colored chips from a box and demonstrates how to solve for the probability of selecting a specific color.

• Lastly, the video features a problem related to a number line, where the goal is to find the value of a specific point on the line using linear equations.