Ron surveyed the class of 18 to determine how many students preferred brownies to cupcakes. He determined that 0.66666666667 students preferred brownies according to his calculator. What is this converted into a fraction? How many students preferred brownies?

Can somebody me out with this question

What is the missing value in the proportion 4/5 = x/30

Andy wants to find the distance d across a river. he located points as shown in the figure, then use similar triangles to find that d = 223.5 feet. how can you tell without calculating that he must be wrong? tell what you think he did wrong and correct his error. round your answer to the nearest tenth if necessary. andy must have used the wrong . the distance d is actually feet.