Question

The difference between a number and eleven is three more than half the number.

Answer 1

difference between a number and 11 --> x -11
is --> =
three more --> +3
half the number ---> x/2

so,
x-11 = x/2 + 3

x-x/2 = 3+11
x/2 = 14
x = 28

28 is your number.