This blog post relates to question #116 from the Official Guide for GMAT Review, 2017.
What intimidates most students here, and sends them spiraling into a black hole of unnecessary calculation, is the first line of the table: 10.8% of 37. It’s not as bad as it looks, but we’ll come back to that…
Do you see a friend? Isn’t 66.7% = 2/3. Since we can’t have fractional marbles, the total number of marbles in Bag Q must be a multiple of 3… in other words,
So, we can dispose of A, D, and E. Let’s try C – the number of marbles in Bag Q is 12
Total Marbles = 37 + 12 + 32 = 81
Back to 10.8% of 37.
- What’s 10% of 37?
- What’s an integer that’s a little more than 10% of 37?
See, that wasn’t so bad.
- Be on the lookout for your friends, and numbers close to your friends.
- Use context to eliminate answers – you can’t have fractional marbles, people, cats, dogs, etc.
- Don’t be intimidated by numbers that aren’t your friends… the people at GMAC are just trying to mess with your head. Don’t let them.