Bobby has a bag containing 2 sizes of marbles. the big ones weigh 10 g and the small ones weigh 3 g. if there are three times as many small ones as big ones and the bag weighs 209 g, how many big marbles does he have?

The number if marbles of different colors stored in a hat is listed below: 4 red marbles 10 green marbles 7 blue marbles. without looking in the hat, dan takes out a marble at random. he replaces the marble and then takes out another marble from the hat. what is the probability that dan takes out a blue marble in both draws?

An 18% discount on a watch saved a shopper $72. find the price of the watch before the discount

Ateam of runners is needed to run a 1 2 -mile relay race. if each runner must run 1 4 mile, how many runners will be needed?