LCM of Coprime Numbers

Q. Three bells ring at intervals of $3,5,$ and $7$ seconds, respectively. If they ring together, how many times do they ring together in the next $7$ minutes?

1. $7$
2. $10$
3. $4$
4. $3$

Q. Find the LCM of $13$ and $14$?

1. $182$
2. $91$
3. $156$
4. $184$

Q. Determine whether LCM of two relatively prime or co-prime numbers is the product of both numbers?

1. Yes.
2. No.
3. Cannot be determined.

Q. 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

Q.

If $7$ represents the area of a rectangle, then in how many different ways this rectangle can be drawn so that measures of its sides are natural numbers?