scheme if else statements

First, it define a variable x and assign 11 to it.
Checks if x is less than 10, in which case is false, so it skip x, and go to the next argument which is another if statement.
The second if checks if the x is greater than 20, x is not, so it skip the first argument x and proceed to the second argument which is expression to multiply x by 2, and the result of the multiplication is the result of this program. It prints 22 since 11 times 2 is 22.

(define x 11)
(if (< x 10)
    x
    (if (> x 20)
        x
        (* x 2)
    )
)

Output:

;Loading "ifelse.scm"... done
;Value: 22