Solve.
-Janine and Thor are both running for class president. Janine goes down a hallway in the school And puts a sticker on every fourth locker. Thor goes down the same hallway, putting one of his Stickers on every fifth locker. If there are 130 lockers in the hallway, how many have both studentsʹ Stickers?
A) 20
B) 13
C) 6
D) 26

Question

Quizplus · Accepted Answer

Lockers that have both students' stickers are those at positions that are common multiples of 4 and 5 within the range of 130 lockers. The least common multiple (LCM) of 4 and 5 is 20, so every 20th locker will have both stickers. Within 130 lockers, there are 130/20 = 6.5, but since we can't have a half locker, it means 6 lockers will have both Janine's and Thor's stickers.

Solve. -Janine and Thor Are Both Running for Class President. Janine