ID 783

ID 1010

The typical healthy resting heart rate in adults is 60–80 beats per minute.

If you live 100 years, how many times will your heart beat?

ID 1064

ID 1780

ID 1947

ID 1952

What is the smallest positive integer that has 12 different positive divisors, including 1 and itself?

ID 2029

ID 2148

ID 2231

An hour ago, I notched up 78987 kilometers on my odometer.

The number is palindromic, reading the same backwards as forwards.

How fast was I driving during the last hour if the current number on my odometer is also palindromic?

ID 2265

ID 3144

The speed of sound at sea level is 333 meters / second.

If the sound of an explosion comes 30 seconds later, how far from me was the center of the explosion?

ID 3182

ID 3199

ID 3220

ID 3301

ID 3376

ID 3955

Choose some of the two-digit numbers on the right so that they add up to exactly 100.

How many numbers do you use?

Do not use any number more than once.

ID 4071

ID 4096

ID 4228

ID 4538

ID 4704

ID 4764

ID 5008

ID 5045

ID 5224

Positive integers and zero are whole numbers.

If N is a whole number, any other whole number can be represented by one of the expressions:

ID 5280

Find two numbers so that their sum, product and the result of division are the same.

What is the largest number?