Trading Assistant Flashcards
How many times does the long hand of the clock pass the short hand between midnight one day and midnight the following day? As both hands are together at the starting time of midnight this does not count as a pass.
21
How can you make the following equation true by drawing only one straight line: 5+5+5=550 Can you figure it out?
There are two ways to do so:
Draw a line on the first plus sign to turn it into a 4.
Change the equal symbol to a crossed-out equal symbol which means “not equal to.”
What number do you get when you multiply all of the numbers on a telephone’s number pad?
Zero, because any number multiplied by 0 will always equal 0.
You go to the doctor because you are ill, and he prescribes you with three pills and tells you to take them every half hour. How long do the pills last you?
An hour because the first pill doesn’t take 30 minutes to take.
Where can you add 2 to 11 and get 1?
On a clock
Once I’m 24. Twice I’m 20. Three times I’m inappropriate. What am I?
The letter “X”
In a lake, there is a patch of lily pads. Every day, the patch doubles in size. If it takes 48 days for the patch to cover the entire lake, how long would it take for the patch to cover half the lake?
The patch doubles in size every day and so on the 47th day the patch will be half the size it is on the 48th day.
An apple is 40 cents, a banana is 60 cents. and a grapefruit is 80 cents. How much is a pear?
Forty cents, because the price of each fruit is calculated by multiplying the number of vowels by 20 cents.
Anna wrote all the numbers from 300 to 400 on a piece of paper. How many times did she write the digit 3?
She wrote it 120 times.
How many days are there in 4 years?
The answer is 1461, because (365 x 4) + 1. One of the years is a leap year.
A bat and a ball cost $1.10. The bat costs one dollar more than the ball. How much does the ball cost?
The ball costs 5 cents, not 10 cents. If one dollar more than 10 cents is $1.10, then $1.10 + 10 cents is $1.20. Therefore, the ball costs 5 cents.
Harry is 54 years old, and his mother, Anna, is 80. How many years ago was Anna three times the age of her son Harry?
41 years ago
Use algebra to prove
You have accidently left out the plug and are attempting to fill the bath with both taps full on. The hot tap takes 6 minutes to fill the bath. The cold tap takes 2 minutes and the water empties through the plug hole in 4 minutes. In how many minutes will the bath be filled?
2 minutes and 24 seconds
Hot tap fills bath at rate 1/6 baths per minute
Cold tap fills bath at 1/2 baths per minute
Water leaves the bath at a rate of 1/4 baths per minute
0.1667 + 0.5 - 0.25 = 0.41667 baths per minute
1/0.41667 = 2 minutes and 24 seconds
The day before yesterday I was 21, and the next year, I will be 24. What day is my birthday?
31st December, because it must be on the 1st of January, when I turned 22 and so 21 the day before. As it is now a new year, I will be 23 this year and so 24 next year.
If it were two hours later, it would be half as long until midnight as it would be if it were an hour later. What time is it now?
9 p.m.
A man is walking down a street night at a constant pace. As he passes the street light, he notices that his shadow becomes longer. Does the top of his shadow move faster, slower, or the same when the shadow is longer than when it is shorter?
This point maintains a constant speed, independent of the length of the shadow.
John, Mark, and Henry are three brothers. Interestingly, their current age is prime. What’s more interesting is that difference between their ages is also prime. How old are they?
Mark is 2, John is 5, and Henry is 7. Age diff 7 – 2 = 5 is prime; 7 – 5 = 2 is prime; 5 – 2 = 3 is prime.
Divide 20 by half and add 30, what do you get?
Seventy, because 20 divided by ½ = 10 + 30 = 70.
There are twelve kids in a classroom. Six kids are wearing socks and 4 are wearing shoes. Three kids are wearing both. How many have bare feet?
Five kids have bare feet.
There are 25 red balls, 47 green balls. and 3 blue balls in a basket. There is a blind man. What is the minimum number of balls that the blind man has to pick to make sure that there are at least 2 balls of different colors?
48 balls. There is a small chance he may pick up 47 green balls in a row.
Nathan has 8 bricks. Seven of them weigh the same amount and one is slightly heavier. Using a balance scale, how can Nathan find the heavier brick in two weighings?
First, he splits them in to piles of 3, 3, and 2 bricks. Then he weighs both groups of 3 with each other. If they balance, he knows the brick is one of the 2 not-weighed bricks and he can weigh them to find the heaver one. If the stacks of 3 bricks do not balance, he will weigh 2 of the 3 bricks. If they balance, he will know the brick left not weighed is heavier, or if they do not balance, he will find the heavier one.
Joe has ten coins totaling $1.19. From these coins, he cannot make exact change for a dollar, half-dollar, quarter, dime, or nickel. What coins does he have?
A half-dollar, a quarter, four dimes, and four pennies.
Sally and Sarah were preparing to have a water balloon fight. “No Fair” cried Sally, “You have 3 times as many as I do!” Sarah said “Fine!” and gave Sally 10 more balloons. “Still not fair!” argued Sally, “You still have twice as many as I do.” How many more balloons must Sarah give Sally for them to have the same number?
Sarah must give Sally another 20 water balloons, giving them each 60. Sally started with 30 water balloons and Sarah with 90.
Sally = x
Sarah = y
y = 3x
y - 10 = 2(x + 10)
y = 2x + 30
y = 3x
x = 30
y = 90
Two people in front of two people, two people behind two people, and two people beside two people. How many people are there?
Four
American currency
Dollar = 1
Half dollar = 0.5
Quater = 0.25
dime = 0.1
nickel = 0.05
penny = 0.01
