Three Introductory Chemistry students each measured 50.0 mL of 1.0 M NaOH into "double-walled" styrofoam cup calorimeters. Then, Sue added 50.0 mL of 1.1 M HCl to her NaOH solution; Karel added 45.5 mL of 1.1 M HCl to his; and Caleb added 50.0 mL of 1.0 M HCl. Two of these students will report, within experimental error, the same increase in solution temperature for the neutralization. Which are the two students? Explain.

I'm able to make a guess which 2 would be close just by looking at what is given, but I wouldn't no where to start to be able to prove it. Can someone please go through this step by step and show me how you arrived at your answer & the calculations so that I can actually understand how this is done?