Fixing the Problem

Here is (approximately) what the current version of the program draws:

The ruler at the top shows the X location of the center of each circle. Each is a multiple of 64 The all balloons could fit if you could shift each balloon's center 32 pixels to the left:

BALLOON	X	Y
1	64-32 = 32	100
2	128-32 = 96	100
3	192-32 =160	100
4	256-32 =224	100
...	...	...
10	640-32 = 608	100

Here is the program without the new change:

' 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               ' calculate an X for this balloon
  CIRCLE (X, 100), 25                ' draw a balloon
  LET BALLOON = BALLOON + 1          ' go on to next balloon
LOOP

END