Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

Five lovely ladies(Sophia, Isabella, Madison, Emma and Olivia) planned a picnic.

They each buy one thing each for the picnic.

Sophia, Emma and Olivia got a drink : orange-Juice, apple-juice, and mango-juice.
Olivia got the drink with the same letter as the one in her first name.
Emma loves mango-juice.
The other two bring some food : chocolates and pizza.
Also Madison is allergic to cheese.

So which ladies bought what ?

Can you solve the below algebraic mathematical equation?

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

What is more useful when it is broken?

Replace the question mark in the picture below.

A little girl goes to the store and buys one dozen eggs. As she is going home, all but three break. How many eggs are left unbroken?

John is the son of Jacob.
So,
Jacob is the_____of John's father?

There are 2 sand hourglasses.

The small one can measure 5 hours and the large one can measure 7 hours.

How can we measure 16 hours with 2 sand hourglasses running together ?

What number when divided in half becomes zero?