Question 736146
<pre>
I knew in advance Greenestamps would come up with the way to solve it the same
way as the 2-legged and 4-legged animal problems, by first thinking how it would
be if they were all one or the other. Then there would either be too few or too
many legs and how many of the other type animal you would need to have to
increase or decrease the number of legs to get the given number of legs.  I've
also seen bicycle/tricycle and 3 and 4-legged stool problems that could be done
the same way.
 
Greenestamps used the "too many points" way.  I'll use the "too-few points way.

(1) If all 18 shots were 1-point free throws, (a really strange basketball
    game lol), the point total would be 18*1 = 18.
(2) The actual point total, 30, is 30-18=12 more than that.
(3) So 12 of those 18 shots must be increased by 1 point to increase the
    total points from 18 to 30. 
ANSWERS: 12 2-point shots; so 18-12 = 6 1-point shots.

Edwin</pre>