What is the numerical value of pi?
How much is "x" in 4x+6=-10?
What is the name of an angle greater than 90 degrees?
Alberto, BenjamÃn and Carlota made a total of 20 sandwiches. Benjamin did 3 times more than Alberto, and Carlota did twice as much as Benjamin. How many sandwiches did Alberto make?
First character: <
Second character: π
Third character: ≠