elizabethslavitt/khan-exercises — comment on commit 34ddff14e327d379822bc447b36b2b46cb9535d7
File: exercises/systems_of_equations_word_problems.html line 171
By smenks13:

If you're so inclined, you could say, "A few weeks later, the *same* group..." to reinforce that the # of teachers and # of students is fixed.