Can you solve the below algebraic mathematical equation?

(J+O+I+N+T)3 = JOINT

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

what does the below math rebus puzzle mean?

Count the squares in the matchstick puzzle below?

What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

Why is the longest human nose just 11 inches?

Cristina leaves home and then she makes exactly 3 left turns and returns home where she found 2 girls wearing the mask.

Who are these two masked girls?

Manish and Manoj play 5 games of chess.
Both Manish and Manoj win the exact same number of games. There is no tie at all.

How?

Two old friends, Jack and Jill, meet after a long time, and discussing as:

Jack: Hey, how are you, man?

Bill: Not bad, got married and I have three kids now.

Jack: That's awesome. How old are they?

Bill: The product of their ages is 72 and the sum of their ages is the same as your birth date.

Jack: Cool..But I still don't know.

Bill: My eldest kid just started taking piano lessons.

Jack: Oh, now I get it.

How old are Bill's kids?