ERJ Brainteaser: July
6 Jul 2026
Each month, ERJ sets a weekly brainteaser, with questions of varying degrees of difficulty. Readers supplying the most accurate (and stylish) answers are then considered for the prestigious Brainiac of the Month title
Question 1: Not double
109.4, 218.7, 437.4, 874.9, _?_.
Clues during the week…
Email your answer: correct replies on Friday.
