Multiple Choice: Triangle ABC has been reduced to create triangle XYZ. By what ratio has it been reduced? Show how you know!

I’m really confused and need your assist me with this question i’ve never been taught

Why is it so easy to buy on impulse and overspend with a credit card? what could you do to counteract this tendency?

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?