Help, please they are under probability Will mark brainiest thanks

The difference of three and the reciprocal of a number is equal to the quotient of 20 and the number. find the number.

Car a and car b were in a race .the driver of car b claimed that his car was twice as fast as car a

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?