You can only unlock the chapter using a special code that we will send you via the Viber app. Receiving a message is free of charge and with no obligations.
My phone number:
Get a code
In compliance with the law, persons under the age of 15 can enter their phone number only in the presence of a parent or guardian.
4-character code:
Check the received code
The page will be refreshed automatically in a few seconds.
we sent you a message with a link. By clicking on the link, you will automatically log in to your profile.
Attention! The connection is valid for 15 minutes. The message is sent only if the user with the given username (e-mail address) exists in the database.
To repaint a room, 3 different colours were bought: 15 kilograms of white, 6 kilograms of red and 4 kilograms of yellow. What is the percentage of each colour when all three colours are mixed together?
The detailed solution steps are locked. Click on the blue button to unlock them.
To ensure the proper functioning of the website, OpenProf uses cookies that do not store personal data. By continuing to use the website, you agree to cookies. Tell me more »
