A bag of marbles had 20 red marbles and the rest were black. For a game, 4/5 of the 20 red marbles were chosen, and 24 of the black marbles were also chosen. How many black marbles were in the bag before the game?

Given the statements, "a square root of 16 is 4," and "a square root of 9 is -3," complete the following blanks with the correct truth-values. p is and q is , so the statement, "a square root of 16 is 4 or a square root of 9 is -3" is .

In what organelle does photosynthesis take place?

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