Question 182649
There are fifty marbles in a sack: red, blue and green.
r  +  b  +  g  = 50
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There are ten more green than blue marbles in the sack.
g = b + 10
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The probability of drawing a red or blue marble is one-half.
r + b = 25 or r = 25-b

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 Write and solve an equation to determine how many of each color marble is in the sack.
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Substitute for r and g to get an equation in "b":

(25-b) + b + (b+10) = 50
b + 35 = 50
b = 15 (# of blue marbles)
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Since r = 25-b, r = 10 (# of red marbles)
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Since g = b+10, g = 25 (# of green marbles)
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blue = 15 ; red = 10 ; green = 25
You have it right.
Cheers,
Stan H.
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I figured the answer would be: blue 15, red 10 and green 25. Can you help me determine the equation? And is the answer right?