Question

Robert and Freddie like to go to the library in their town to borrow books. Robert goes to the library every 9 days and Freddie goes every 12 days. If they met at the library earlier this evening, in how many days will they both next be at the library on the same day again? ​

Answer 1

Answer: 36 days

Explanation:

that’s the lowest multiple of 9 that also is a multiple of 12. It’s the LCF aka Least Common Factor