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Q: Add numbers 1 to 100!

How much are all numbers between 1 and 100 added together?

Answer: here

Q: How many girls?

There are 600 pupils in your school. There are 30 more girls than boys. How many girls are in that school?

Answer: here

Q: What is the 75th Fibonacci Number?

Answer: here

Q: How many patterns?

You want to decorate a wall with 4 tiles in a row. There are 2 tiles each of red, green and blue available. You want to use all 3 colours. How many different ways can the tiles be arranged?

Answer: here

Q: Estimate the area of a circle

Answer: here

Q: What is the probability of throwing 3 Sixes with 3 dice?

Answer: here