Outside walls must be insulated with at least 4 inches of fiberglass batting or with at least 3 inches of plastic foam insulation.

Answer:

' Building code tester
'
PRINT "Enter inches of fiber glass"
INPUT FIBER
PRINT "Enter inches of plastic foam"
INPUT FOAM
IF FIBER >= 4 OR FOAM >= 3  THEN
  PRINT "House meets Code."
ELSE
  PRINT "House does NOT meet code."
END IF
'
END

Since it is even better if the house exceeds requirements, OR is the correct choice.

Difference between AND and OR

Here is what would happen if a house had 6 inches of fiberglass batting and 0 inches of plastic foam:

FIBER >= 4 OR FOAM >= 3
---------    ---------
  true          false
   ---------------
        true

One TRUE is enough.

AND is different from OR. Both of them combine TRUE/FALSE values into one TRUE/FALSE value. But each does it in a different way:

The values AND combines must all be TRUE to get a TRUE.
The values OR combines must have at least one TRUE among them to get a TRUE.

QUESTION 21:

Pick TRUE or FALSE for each of the following:

5 > 2 OR   12 <= 7       T or F

5 > 2 AND  12 <= 7       T or F

3 = 8 OR   6 <> 6        T or F

3 = 8 AND   6 <> 6       T or F

(Remember that <> means "not equal.")