Explain this ? i don't understand it

Car a and car b were in a race .the driver of car b claimed that his car was twice as fast as car a

In a small section of a stadium there are 40 spectators watching a game between the cook islands and fiji. they all support at least one of the two teams. 25 spectators support the cook islands and 16 of these support both teams. how many support only fiji?

Determine the standard form of the equation of the line that passes through (-2,0) and (8,-5)