m4maths Maths Puzzle

Place the numbers 1 through 100 on a 10x10 square table so that all consecutive numbers will be on adjacent (right, left, up, down) squares. What will be the maximum value of the sum of the 10 numbers along a diagonal of this table?

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m4maths Other Question

There are 50 coins. Half of them are genuine and the other half are counterfeit. Genuine coins weigh 10 grams, while counterfeit coins differ from the genuine coins by 1 gram (some of them weigh 9 grams, and some of them weigh 11 grams). You have a balance scale with two pans. In each weighing the scale shows the difference of the weights placed in each pan. You will randomly choose a coin. What is the minimum number of weighings necessary to guarantee to determine whether it is genuine or not? A train crosses a platform 100meter long in 60seconds at a speed of 45kmph the time taken by the train to cross an electric pole is
a.8sec b.52s c.1minute d.data inadequate