<PRE><B>Question 855713</B>
A box contains a group of 24 blocks. Some are red, some are yellow, and some are green. The probability of 
drawing a red block is 1/3. The probability of drawing a green block is 1/12. Determine the number of yellow blocks. 
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P(red) + P(green) + P(yellow) = 1
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1/3 + 1/12 + x = 1
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Multiply thru by 12 to get:
4 + 1 + 12x = 12
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x = 7/12 (P of drawing a yellow block)
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# of yellow blocks:: (7/12)24 = 14
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Cheers,
Stan H.</PRE>