There are 28 players in the national football team, 14 play midfield and defence , 15 play defence and attack and 3 play midfield only. The number of players who play attack only is twice that of those who play defence only and the number who play defence is equal to that of those who play attack. if 18 play midfield , represent the info on a venn diagram. How many players play : - defence . - attack and midfield . - only one position​