How to control the boldness for both text and math formulas

In the given picture I want to make the statement of the problem more bold but less the line "DM Your Answer!". ASimilarly I want to make math expressions bold but less bold than the logo of the page " Creative Math Solving"

I want to make some of the text very bold, some less bold. Same for math formulas. I want to make very bold the page logo and make less bold the given conditions of the problem. Also I want to control the bold like I can create a new color in xcolor package by selecting rgb values. Same here. I want to create a new bold (like the heading boldness will be 2mm and normal letters will be 1mm)

How to do that.