Jenny, Demi, and Shaina buy a 21-inch gourmet sandwich and take it back to their apartment. Since they have different appetites, they cut the sandwich so that Demi gets a piece that is double the size of
Jenny’s piece and Shaina gets a piece that is 1 inch longer than Jenny’s piece. Find the length of each
person’s piece of the sandwich.

Solve the problem by using a venn diagram a group of students were surveyed about their taste in music.they were asked how they like three types of music: rock, country western and jazz.the results are summarized below: no one dislikes all three types of music.six like all three types of music.eleven don’t like country western.sixteen like jazz.three like country western and jazz, but not rock.six don’t like rock.eight like rock and country western.seven don’t like jazz.how many students were surveyed?