self Maths Puzzle

for weighing 255kg of weight how many weight measurable stone is required(minimum) and what is the valu of these stone

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self Other Question

find the next no. of series
2,9,28,65,126,...

1.198
2.225
3.217
4.248
5.241
In a race of boom, A can beat B by 60 meter and in a race of 500 meter, B can beat C by 25 meter. by how many meters will A beat C in a 400 meter race?