Gram Jar

Gram Jar

In a jar containing only?

red and blue marbles, 40% of the marbles are red. If the average weight of a red marble is 40 grams and the average weight of a blue marble is 60 grams, what is the average weight of all the marbles in the jar?

Full Explanation will be given five stars.

To make it easy, let's suppose that there are 100 marbles in the jar. The total wieght of the red ones is 1600 grams (40 x 40), and the total weight of the blue ones is 3600 grams (60 x 60). So all the marbles together weigh 5200 grams. Now divide that weight by the total number of marbles, and you get 52 grams as the average weight of each one. This will work no matter what the actual total of marbles is, as long as the other factors stay the same. Someone else will probably set up an equation for you.

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