Solution explanation - All the Quant Ch. 8, problem #3

[MaggieM76]

Hello,

I'm wondering if someone would be able to explain the solution to question number 3 of the problem set for Chapter 8 in "All the Quant"?

It looks like there is a solution error but I just want to confirm before claiming that.

Thanks,
Maggie

[Sage Pearce-Higgins]

Apologies for that. You're right - there is an error in the solution - the answer should be -9.5

https://www.manhattanprep.com/gmat/erra ... h-edition/