self Maths Puzzle

4 identical blocks of length l are arranged one over the other. the maximum distance of the uppermost block from the edge of teh lowermost block is x such that no block tumbles then x is?

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self Other Question

friends today i had tcs apps xam..i atended 15 ques and confident that those ques are correct.ur negative marks will be taken to account and ur percentage of accuracy is the major part of selection.can anser 15 ques solidly and never try to aten any ques in guess.only 1 prblm on time & work and nothing from speed & distance..i cleared apps round..all d best.. F
armer Thimmayya bought some mules at Rs. 50each, sheep at Rs. 40 each, goats at Rs, 25 each. and pigs at Rs. 10 each. The average price of the animals per head worked to Rs. 30.How many animals of each kind did he buy