lets assume the number is arrange as follow: a, b, 55, c, 2a + 20 a <=b <= 55 55 <= c <= 2a+20 we are being told that average is 55, hence sum of all 5 numbers is 275. The sum of the smallest and the largest numbers is 3a+20. since we are asked about the minimum a, then we have to find ...

For whatever reason, certain mixture problems have been giving me a bunch of anxiety and throwing me off. I've read a few different techniques- and I *thought* I understood the method using the following formula: C1*V1=C2*V2 But I've had a couple of problems using it and I was hoping someone could m...

I think my reply was deleted, but I added the source to the problem/info I quoted (GMAT Club)... which I think is an approved source? Thanks so much for the thorough response. I apologize for not explaining the formula better from the get go. As you recommended, I do try not to be reliant on formul...

You're absolutely right. There's multiple ways to get to the answer. And I'm slowly learning that the GMAT tests our ability to choose the most efficient route to the right answer moreso than our ability to produce the right answer. I think I'll go back to sticking to mostly OG2020 problem sets and ...