Lesson: Summarizing Information

Comment on Summarizing Information

i found the videos very

i found the videos very useful.

yeah, great effort and

yeah, great effort and explanation ;)

Really good and easy to

Really good and easy to understand!

Can you please explain how the both answer choices are sufficient for the question (of the 27 children...how many are boy?) I thought that both answers were insufficient because they did not provide any exact number.

Once we have two different

Once we have two different linear equations with 2 variables, we can solve that system for the two variables. In other words, we can find the exact values of B and G.

This is covered in these two videos:
- https://www.gmatprepnow.com/module/gmat-algebra-and-equation-solving/vid...
- https://www.gmatprepnow.com/module/gmat-algebra-and-equation-solving/vid...

Let's take the first statement where we have:
B = 2G
B + G = 27

Since B = 2G, we can take the second equation B + G = 27, and replace B with 2G.
We get: 2G + G = 27
Simplify: 3G = 27
Solve: G = 9

Once we know that G = 9, we can take one of our equations (e.g., B = 2G) and replace G with 9.

We get: B = 2(9) = 18

So, G = 9 and B = 18
In other words, there are 18 boys.

Does that help?

Cheers,
Brent

This helped a lot! Thank you

This helped a lot! Thank you for explaining!

It makes sense now, thank you

It makes sense now, thank you!

Love how neat and concise the

Love how neat and concise the information is explained and presented! Thank you

Thanks for that!