exam Maths Puzzle Numerical Ability

p (girl,boy,girl) WITHOUT REPLACEMENT
P (boy,girl) WITHOUT REPLACEMENT
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p (Boy,girl) WITH REPLACEMENT
P (girl,girl,girl) WITH REPLACEMENT

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exam Other Question
A 60 ft. pipe is divided into three peices. One peice is twice a long as the shortest peice, and the third peice is 4 feet less than five times the shortest peice. Find the length of the shortest peice. (a^2-ab-12b^2/12)/(2a^2+7ab+3b^2/16a+8b)