If white balls have a mass of 5.0 grams and black balls have a mass of 2.0 grams, in a box containing white and black balls with #2/3# of the balls being white, what is the average mass of a single ball in this box?

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Answer 1 · 2015-09-02T11:07:06

Average mass (per ball) #= 4.0# g.

If #2/3# of the balls are white

then we could group the balls into groups of 3 with 2 white balls and 1 black ball in each group.

Each group would weight #2xx5.0" g" + 1xx2.0 " g "= 12.0 " g"#

and since there are #3# balls in each group,
the average weight would be #(12.0" g")/3 = 4.0 " g"#