Questions

The logic in the given puzzle is - Number of squares in the figures.

Hence, the number of squares in the question figure is 14.

7th may is considered as world's Asthma day .This worked with the theme of "you can controll your asthma"

Normal Gas welding use oxygen-acetylene.

Depending on what materials you are welding, there are some more options that might be used.

For example - MIG/TIG use Argon, MAG use an argon-something mix.

An up - selling is getting the customer to spend more money, buy a more expensive model of the same type of product, or add features or warranties that relate to the product viewed or purchased. 

A cross - sell is to get the customer to spend more money by adding more products from other categories than the product being viewed or purchased.