You might try this:
img.drawString(60/tkt<10 ? ""+(60.0/tkt) : ""+(60/tkt));
img.drawString(60/tkt<10 ? ""+(60.0/tkt) : ""+(60/tkt), 0, 15);
img.drawString(60/tkt<10 ? ""+(60.0/tkt) : ""+(int)(60/tkt), 0, 15);
img.drawString(60/tkt<10 ? "" + 60/tkt : "" + (int)(60/tkt), 0, 15);