exam Maths Puzzle Numerical Ability

give ab=be;bc=bd
prove ac=de

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exam Other Question

A 25 inch rope is cut into 3 peices such that the middle sized peice is 1 inch longer than the shor piece and the longest is twice as long as the short peice. How long is each peice? joe can paint all the rooms of a house in 20 hours it takes ross 60 hours to do the same thing. How long would it iake them if they worked together?