Without altering the meaning of the following sentences, reduce the number of words in them.
a. After having completed work on the data-entry problem, we turned our thinking toward our next task, which was the processing problem.
b. Those who plan federal and state programs for the elderly should take into account the changing demographic characteristics in terms of size and average income of the composition of the elderly population.
c. Would you please figure out what we should do and advise us?
d. The result of this study will be to make total white-water recycling an economical strategy for meeting federal regulations.