GMAT Quant

The function f is defined for each positive three-digit integer n by , where x, y and z are the hundreds, tens, and units digits of n, respectively. If m and v are three-digit positive integers such that then ? (A) 8(B) 9(C) 18(D) 20(E) 80 The real trick here is to think about f(m) … Read More

Look at what you’re trying to do: reduce the amount of ash by reducing the number of truckloads. Fewer truckloads does not necessarily mean less ash. If you were the corporate lawyer, your job would be to figure out how to reduce the number of truckloads while keeping the amount of ash exactly the same. … Read More

This is rated hard. Why? Mostly it’s picking what to do quickly. First eliminate the mixed numbers, then cancel the 15s in the bottom–don’t flip and multiply if possible. https://stan.store/yourgmatcoach FREE Factoring Magic Video Course: https://stan.store/yourgmatcoach/p/gmat-factoring-magic-8video-course- (2 3/5− 1 2/3)/(2/3 – 3/5) (A) 16(B) 14(C) 3(D) 1(E) -1

The question you want to ask yourself–no matter how weird it sounds on the surface–is this: does swimming cause asthma, or does asthma cause swimming. In this case, you’ll find out that quite possibly asthma causes swimming. Which of the following most logically completes the argument given? Asthma, a chronic breathing disorder, is significantly more … Read More

Just focus on how many zeros there are after the 1. That’s 50, so 51 digits. Subtract the 74 and that leaves a 50-digit number with 26 at the end. That’s pretty much it. If 10^50–74 is written as an integer in base 10 notation, what is the sum of the digits in that integer? … Read More

Survivorship bias is when you make a judgement based on surviving examples only. “Music was better in the 1960s.” Maybe, but you’re only listening to the good stuff because that’s all we hear now. You aren’t hearing all the crap that was played on the radio back then. Guidebook writer: I have visited hotels throughout … Read More

A couple decides to have 4 children. If they succeed… Find the number of ways to select “exactly two boys and two girls” and then calculate the probability for one of these ways. Then multiply these two terms together. A couple decides to have 4 children. If they succeed in having 4 children and each … Read More

Honestly I think the answer is fairly easy to see here. Students hardly ever get this correct. Can you? Which of the following most logically completes the argument? The irradiation of food kills bacteria and thus retards spoilage. However, it also lowers the nutritional value of many foods. For example, irradiation destroys a significant percentage … Read More