Learn to write procedures and build them into Logo programs. Learn to use variables.
Write a Logo program, putting in variables, and see the effect when you change the variables.
A geometry lab crafted in a functional programming language. Ported
to Flash from the original java at web.comlab.ox.ac.uk/geomlab
Let the number of cases solved in 2003 be $x$. This was $80\%$ of the number of cases, so there were $5x/4$ cases to solve in 2003. So the number of cases to solve in 2004 was $5x/4 \times 6/5$, which is $3x/2$. Inspector Remorse solved $60\%$ of the cases, which is $9x/10$. So there was a $10\%$ decrease in the number of cases solved.
This problem is taken from the UKMT Mathematical Challenges.