A friend of yours draws a circle circumscribing a regular octagon. What is the ratio of the area of the octagon to the circle?

## Population Growth

Which of the following would be best to use for population growth with known upper limit?

**Subscribe below** to get the DAT Question of the Day delivered straight to your inbox every morning.

## Effectiveness of Hand Wash

Bacteria such as V. cholerae are known to follow an exponential growth curve rate, and will double their number every 15 minutes. Fortunately, anti-bacterial hand wash can kill 99.9% of bacteria on a surface. If a colony of 500 V. cholerae cells are left alone for 2 hours, then anti-bacterial handwash is applied thoroughly, how many bacterial cells are left?

**Subscribe below** to receive the DAT Question of the Day delivered straight to your inbox every morning.

## Filling Cylinders

How many cubic centimeters of water will approximately be required to fill a cylinder with a 3 cm radius and 7 cm height?

**Subscribe below** to get the DAT Question of the Day delivered straight to your inbox every morning.

## Predict Number of Lions

A researcher is attempting to predict the number of lions in an African habitat based on previous data. He has formed a regression equation which is: Y = 25 + 0.5X – 2ZX, where X is the number of years since the first population sample, and Z is the death rate of the lions. If it has been 10 years, and the death rate is 1 lion per year, what is the predicted number of lions in the habitat?

**Subscribe below** to receive the DAT Question of the Day delivered straight to your inbox every morning.

## The Matrix

It takes 6 minutes and 12 minutes, respectively, to run two computer programs when they are run one at a time. However, their speeds are reduced by 50% and 40%, respectively, if running in parallel. If a PC starts running the two programs together, how long will it take for them to finish?

**Subscribe below** to get the DAT Question of the Day delivered straight to your inbox every morning.

## Car Journey

Mark’s car began a journey from a point at 7 AM, traveling at 30 mph. At 8 AM Jason’s car started traveling from the same point at 40 mph in the same direction as Jason. At what time will Jason pass Mark?

**Subscribe below** to receive the DAT Question of the Day delivered straight to your inbox every morning.

## Mind Games

X is a multiple of A. A is always even, and is always divisible by B. X is also never divisible by C. Which of the following statements must be true?

**Subscribe below** to receive the DAT Question of the Day delivered straight to your inbox every morning.

## Bobbing For Apples

There are 5 white, 7 red and 8 black balls in a box. If you are blindly picking up balls from the box, what is the minimum number of balls you need to take out of the box to ensure that you have at least 2 balls of the same color?

**Subscribe below** to receive the DAT Question of the Day delivered straight to your inbox every morning.

## Always be Investing

Albert and Samuel are given $10,000 each by their grandparents. Albert puts his money into the stock market immediately, earning 5% interest each year. Samuel holds onto his money for 2 years, before also investing in the stock market at the same interest rate as Albert. After 4 years, how much more money does Albert have?