When a number is a multiple of 6 what are possible values of the ones digit

1mile equals approximately 1.6 kilometers. which best approximates the number of miles in 6 kilometers?

Which number produces a rationale number when multiplied by 1/5

Jack has a piece of red ribbon that is two times as long as his piece of blue ribbon. he says that he can use two different equation to find out how long his piece of red ribbon is compared to his piece of blue ribbon is. is he correct? explain his reasoning