Answer:

  LET X = BALLOON * 64 - 32  ' calculate an X for this balloon

Subtracting 32 from X for each center moves each balloon to the left by 32. This program is starting to get pretty sophisticated, so if you don't quite see this, don't worry terribly. Typing in the program and playing with it might help.

Shifted Balloons

Here is the complete program:

' Draw 10 Red Balloons
SCREEN 12     ' start up graphics
COLOR 4       ' set the pen color to red
'
LET BALLOON = 1              ' start with balloon number 1
DO WHILE BALLOON <= 10       ' end with balloon number 10
  LET X = BALLOON * 64 - 32  ' calculate an X for this balloon
  CIRCLE (X, 100), 25        ' draw a balloon
  LET BALLOON = BALLOON + 1  ' go on to next balloon
LOOP
'
END

QUESTION 21:

Do balloons need strings?