elizabethslavitt/khan-exercises — comment on commit 34ddff14e327d379822bc447b36b2b46cb9535d7
File: exercises/systems_of_equations_word_problems.html line 99
By smenks13:

I think "bags of candy" and "bags of cookies" works well with how the problem's written, for both UNIT_1 and UNIT_2.