This is a high earning offer from taskbucks where they are giving Rs 20 for installing olx app and posting an add. So you can get Rs 20 by installing and posting your ads. To avail this offer open taskbucks app and click on app tab on top left corner. From there install Olx app. Rs 20 will be credited to your account after seven days. That means you will have to keep the app installed for a week to avail Rs 20 free recharge. You will get whole amount on the seventh day from the date of installation of the app.