Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

There is a shop where written:
Buy 1 for $1
10 for $2
100 for $3
I needed 999 and still only paid $3. How could this be financially viable for the shop-keeper?

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

A girl has as many brothers as sisters, but each brother has only half as many brothers as sisters. How many brothers and sisters are there in the family?

Decode below rebus
D
N
A
T
S , D

One day, John and his friends were playing around. Jacob hit something with a Pin and it popped. John's dad came into the room that very moment, but he wasn't mad. In fact, he was smiling. What did Jacob hit?

Find the missing number in the sequence below:

Replace the question mark in the picture below.

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

using four eights (8) and a one (1) and one mathematical symbol , create the number 100