ID 691

Tim received the following scores in the online math tests:

80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, and 89%

What was his average (mean) score?

ID 745

A week ago, Anna's jar was filled with 100 jellybeans.

She always took the jellybeans without looking into the jar.

Today, there are 11 green and 9 red.

Estimate the number of red jellybeans she has eaten.

ID 748

A catering company places 14 people around six tables.

What is the minimum and maximum number of people sitting around 15 tables that are all linked together on at least one side? (There must only be one group; they can't be linked in pairs, for example.)

ID 1185

ID 1186

One person is chosen at random from the list.

What is the probability that his/her name includes the letter e?

ID 1254

ID 1287

John chooses one tile without looking. He counts the number of spots.

What is the most likely number of spots on his tile?

ID 1406

Eugenia earned 60, 65, 71, 79, 85 and 90 on her mathematics examinations.

If she receives a score of 82 on the seventh exam, then the average will . . .

ID 1566

ID 1576

ID 1784

The average of a set of 12 numbers is 12.

If 1, 2 and 3 are added to the set, what is the new average?

ID 1943

I placed 6 cards in a box.

Two cards are blue on both sides, two cards are green on both sides, and two cards are green on one side and blue on the other.

If the first randomly chosen card is green on one side, what is the probability that the other side is also green?

ID 1957

ID 1978

I have six poles with the length of 1, 2, 3, 4, 5 and 6 meters.

How many different ways are there to make a triangle by choosing three appropriate poles?

ID 1984

There are five traffic lights on River Avenue.

In how many ways can the lights be set so that no neighboring lights have the same color?

ID 2051

Three apples were weighed in pairs and the weights were 200, 204, and 208 grams.

What is the weight of the lightest apple?

ID 2270

ID 2275

The base of the pyramid is a square.

How many layers are there in such a pyramid, composed of 140 balls?

ID 2308

ID 2310

ID 3004

In a survey of students, 2/3 of the girls and 1/2 of the boys preferred using pens over pencils.

Girls make up 75% of the students in the school.

What percent of the students prefer using pens?

ID 3027

A bag contains six green, five gray, and four violet marbles.

If two marbles are drawn at random from the bag, what is the probability that they are green?

ID 3043

ID 3118

The slice that has been eaten had 7 mushrooms on it.

What is the estimated number of mushrooms on the entire pizza?

ID 3134

In a class, 95% of the students earned A grades on the first test, 90% earned A grades on the second test, 85% on the third test, and 80% on the fourth test.

What is the smallest possible percentage of students who earned A grades on all the tests?

ID 3211

John earned an average of 90% on his five exams.

What is the lowest possible percentage score he could have received in any one of the exams?

ID 3215

On the chessboard, what is the probability that a randomly chosen square is dark and it touches the outer edge of the board?

ID 3277

ID 3370

Anna recorded the temperature every day for a week (7days).

It was 22° on Monday.

The temperature decreased by 3° every day.

What was the average temperature for the week?

ID 3435

The table shows the results of a competition among 5 teams.

How many teams received less points than the average?

ID 3447

Bob the plumber has 8 pockets and 40 nuts.

He wants to put the nuts in all of his pockets so that no two pockets have the same number of nuts.

What is the largest number of nuts that a pocket can possess?

ID 3497

Bob shaves himself 3 minutes every day including the weekends.

If he starts shaving at the age of 20 and lives 70 years, what is the total amount of time spent shaving?

ID 3503

A palindrome is a word, phrase, or sequence that reads the same backwards as forwards.

For example, 123454321 is a nine-digit palindrome.

What is the minimal difference between two nine-digit palindromes?

ID 3530

ID 3580

John owns 3/4 of a timber business and sells 2/9 of his share for $600,000.

What is the value of the business?

ID 3583

A surgeon has two pairs of surgical gloves.

What is the maximum number of people on which he is able to operate?

There is no blood contact between the people including the surgeon.

ID 3639

Arrange nine numbers in a circle so that the difference between neighboring numbers is always less than 3.

Which of the following pairs cannot be neighbors?

ID 3661

ID 3759

Anna needs $250 to buy a music box. In January, she saved $4. She saved twice as much in February as she saved in January.

If she continues to save twice as much each month as she saved the previous month, in what month will her total savings be enough to purchase the device?

ID 3853

Maria answered 22 of the 25 questions on her test.

Half of them, she did correctly.

What is her score on the test?

ID 3958

The symbol N! denotes the product of the first N positive integers.

Find the value of N for which

(3!)(4!)(7!) = 2(N!)

ID 4285

ID 4310

Nine people stand in a queue.

The first person takes 9 apples, and each other man takes one apple less than the person before him.

The last person takes the last apple.

What percentage of the total number of apples does the first person take?

ID 4380

ID 4629

ID 4645

ID 4671

ID 4685

ID 4807

ID 4898

A bus can hold 66 students.

The bus starts out empty and picks up 1 student at the first stop, 2 students at the second stop, 3 students at the third stop, and so forth.

After how many stops will the bus be full?

ID 4922

The letters A, E, I, O, and U are vowels.

What percent of the letters in the word FACEBOOK are vowels?

ID 5162

What is the sum of dots that are not visible from the current direction, but would be visible if the tower were looked at from the other side?

The opposite sides of a standard die have numbers that add up to seven.

ID 5241

Martin saves $8 on March 1.

Each day after that he saves $2 than he saves the day before.

How much would he save on April 1?

ID 5283

Three brothers share their father's sheep.

Father said that the second son gets 20% less sheep than the elder son, and the youngest son gets 20% less than the second son.

How many sheep does the elder son get if there are 488 sheep in total?

ID 5288