Math
I am a number with two digits. If you reverse my digits, I become 27 more than I was. What number am I?
36
(63-36 = 27)
I am essential for respiration in living beings. Without me, we wouldn't be able to breathe. What am I?
Oxygen
I am a continent that is home to the Sahara Desert and the Nile River. What continent am I?
Africa
How many players are on the field at the same time? (for Major Professional Leagues)
22 (11 from each team)
What has keys but can't open locks?
Piano
I am a three-digit number. My tens digit is five more than my ones digit, and my hundreds digit is eight less than my tens digit. What number am I?
194
(tenth = 4 + 5 -->9, hundreds = 9 - 8 --> 1)
I can be liquid, solid, or gas, and I am needed for most chemical reactions. What am I?
Water
I am a country where the Great Wall is located. What country am I?
China
Which country won the FIFA World Cup in 2018?
France
I am something you can catch but not throw. What am I?
I add five to nine and get two. The answer is correct, but how?
It’s 2 o'clock in the afternoon
I am a simple, colorless gas that plants need for photosynthesis. What am I?
Carbon dioxide
I am an island country known for kangaroos and koalas. What country am I?
Australia
Why are soccer fields so unsure about making decisions?
Because they have two opposing goals
The more you take, the more you leave behind. What am I?
Footsteps
I am a number that is the same when read forwards and backwards. What number am I? (multiple answer possible)
any palindromic number (121, 131, etc.)
I am known for my role in making up the universe, and my name sounds like a type of particle. What am I?
Atom
I am a city in North America that is famous for its Golden Gate Bridge. What city am I?
San Francisco
Which club has won the most UEFA Champions League titles?
Real Madrid
I am not alive, but I can grow. I don’t have lungs, but I need air. What am I?
Fire
What is the integral of 4x^3-2x+1?
x^4−x^2+x+C
What is the atomic number of gold?
79
What is the smallest country in the world by land area?
Vatican City
Who was the first player to win three FIFA World Cup titles?
Pelé
What is seen in the middle of March and April that can’t be seen at the beginning or end of either month?
The letter “R”