The maths required is not beyond the most elementary education, but the majority of people – even students at Ivy League colleges – only answer between one and two of the three questions correctly.23 That’s because they are designed with misleadingly obvious, but incorrect, answers (in this case, $0.10, 24 days, and 100 minutes). It is only once you challenge those assumptions that you can then come to the correct answer ($0.05, 47 days, and 5 minutes).
