Others Maths Puzzle

A wooden unit cube rests on a horizontal surface. A point light source a distance x above an upper vertex casts a shadow of the cube on the surface. The area of the shadow (excluding the part under the cube) is 35.
Find value of x.

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Others Other Question

Can you find the values of integers a, b, c so that a/b + b/c + c/a an integer.
where a# b#c
means a,b,c are not equal to each other. Three positive integers are formed by using all the 10 digits ( 0 -9).
The largest number is sum of other two numbers. Find these numbers.