other Maths Puzzle Numerical Ability Geometry

The height of a right circular cone is trisected by two planes drawn parallel to its base.What will be the ratios of volumes of the three portions starting from the top?

Note: If the ratio is 1:12:13 , write it as 11213.

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The positive integers N and N+1 both have digit sums that are divisible by 7. What is the smallest possible value of N? If, 2=5, 3=10, 4=17, 5=?