The triplet threat

"It's the first day of the fourth grade at Arthimos Elementary and things are already off to a strange start--poisonous cookies, a zipline disaster, a missing iPad, and what are those strange sounds coming from the school custodian's wheelbarrow? Luckily the Prime Detectives--Abby zthe Abacusy Feldstein, Cameron zCamy McGill, and Gabriel zGabey Kim--are on the case! Using arithmetic, geometry, and logic, the Prime Detectives are sure to figure ou...