An easy way to solve this would be using a easy formula :- The least value of a venn diagram is total- People who like a= 100%-70%=30% Total - People who like b= 100%- 75%=25% Total- People who like C = 100%- 80%= 20% Sum all the remaining and subtract from the total:- 100%- ( 30% + 25% + 20%)= 25% ...