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 23 of the balls being white, what is the average mass of a single ball in this box?

1 Answer
Sep 2, 2015

Average mass (per ball) =4.0 g.

Explanation:

If 23 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 2×5.0 g+1×2.0 g =12.0 g

and since there are 3 balls in each group,
the average weight would be 12.0 g3=4.0 g