book Maths Puzzle Numerical Ability

A ladder is resting against a wall. The top of the ladder touches the wall at a height of 15 feet. Find the length of the ladder if the length is 5 feet more than its distance fr

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I am having trouble with a problem, I think I found the answer but, I am not sure. My question is Solve the subtraction problem 8/9 - 3/4? I think the answer is 5/36? Am I right, Please let me know. What quantity of 60 per cent acid solution must be mixed with a 20 per cent solution to produce 720 mL of a 50 per cent solution?