The marks obtained by a set of students in an examination are given below: Marks5,10,15,20,25,30
No. students4,4,612,X,4
 
 
 the mean =18
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The diameter of a circular chip is doubled to use in a new board game. the area of the new chip will be

Hector and alex traded video games. alex gave hector one fourth of his video games in exchange for 6 video games. then he sold 3 video games and gave 2 video games to his brother. alex ended up with 16 video games. how many video games did alex have when he started?

Hi, can anyone show me how to do this problem? 100 points for this. in advance