Of the three broad types of magazines trade, professional, and business magazines; industrial, company, and sponsored magazines; and consumer magazines which category has more publications than the other two?

The correct answer is letter "A": trade, professional, and business magazines.

Explanation:

Trade, professional, and business magazines are focused in one sector only and it is mainly the business world. These types of magazines have more publications than the others since there is potential for profit through target advertising which is the type of publications where both the advertisers and the publishers offer a good or service directed to a specific customer population.

u = 30

continuing your method

= +

subtract from both sides

= - thus

= -

= ⇒ u = 30