Question

Burak has organized an event of planting trees on the upcoming World Environment Day. He wants to plant 7 or 9 or 11 trees in each row. The minimum number of trees Burak would have is

Answer 1

Burak wants to plant 7 or 9 or 11 trees in each row.

$\therefore$ Total number of trees must be the multiple of $7,9,$ and $11.$

The minimum number of trees Burak would have is the LCM of $7,9,$ and $11$.

Since $7,9,$ and $11$ are co-prime numbers, LCM is the product of these numbers.

LCM $=7\times 9\times 11=693$.
So, Burak has minimum $693$ Trees.