Which number will make the two fractions equivalent? 6/7=?/21

Fiona and her friends are playing a game by guessing where a coin will land when it is randomly dropped inside the square shown below. fiona guesses that the coin is likely to land in the blue area. which explains whether or not fiona is correct and why?

Can some one explain how to slove specifically, what is the value of x? 0.9(x+1.4)-2.3+0.1x=1.6 enter the answer as a decimal in the box. x= ?

Paul’s car is 18 feet long. he is making a model of his car that is 1/6 the actual size. what is the length of the model?