Question

Ben thinks of a number. He adds half of the number to a quarter of the number. The result is 60. What was the number Ben first thought of ?

Answer 1

Let be x the number that Ben thought of, and write the equation:
x/2 + x/4 = 60
Solve for x:
3x/4 = 60
3x = 60*4
x = 240/3
x = 80
Ben thought 80.