Question

During February, Kevin will water his ivy every third day, and water his cactus every fifth day. Will Kevin water both plants together again in February? Explain.

Answer 1

No, he will not because there is only 27-29 days in February and 15 is the only common multiple of 3 and 5.

Answer 2

Answer: Yes, Kevin can water both plants together again.

Explanation:

Given: Kevin waters his ivy every third day, and his cactus every fifth day

such that the number of days after Kevin will water both plants together again=least common multiple of 3 and 5= 15

Thus, after 15 days Kevin can water both plants together again.

As in February, there are 28/29 days , thus if he waters plants before 13/14 february respectively[28-15=13, 19-15=14], then he will sure water both plants in february again.