Students of grade 5 have a mathematics test after every 3 days, English after every 6 days and Science test after 9 days. If all the three tests were conducted today. Find, when will the three tests be conducted together again?

After 18 days

After 17 days

After 16 days

None of these

To find when all three tests will be conducted together again, we need to find the least common multiple (LCM) of 3, 6, and 9.

The LCM of 3, 6, and 9 is 18.

So, all three tests will be conducted together again after:

18 days