How do you go from 98 to 720 using just one letter?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

Rearrange the letters in "new door" to make one word.

Can you start the fire using two pieces of wood?

There was a greenhouse.
Inside the greenhouse, there is a white house.
Inside the white house, there is a red house.
Inside the red house, there are lots of babies.

What is It?

A bomb exploded in a room full of married couples and no one died. How?

John can eat 27 chocolates in an hour, Jacob can eat 2 chocolates in 10 minutes, and Jolly can eat 7 chocolates in 20 minutes. How long will it take them to share and eat a box of 120 chocolates whilst playing Chess?

A number with an interesting property:

When I divide it by 2, the remainder is 1.
When I divide it by 3, the remainder is 2.
When I divide it by 4, the remainder is 3.
When I divide it by 5, the remainder is 4.
When I divide it by 6, the remainder is 5.
When I divide it by 7, the remainder is 6.
When I divide it by 8, the remainder is 7.
When I divide it by 9, the remainder is 8.
When I divide it by 10, the remainder is 9.

It's not a small number, but it's not really big, either.
When I looked for a smaller number with this property I couldn't find one.

Can you find it?

I am never scared but became petrified and can’t live in a house but would die to make one. What am I?

Find the next number in the series

12, 20, 40, 72, 116, 172 ?