HR Interview Interview Numerical Ability Arithmetic

Three companies say company A, company B and company C each have some tractors. To start with company A gives company B and C the number of tractors each of them have. After this transaction company B gives company A and C the number of tractors each of them have. Next company C gives company A and B the number of tractors each of them have. At the end of these transactions each of the company A, B and C have 24 tractors each. Can you find the number of tractors company A, B and C initially have.

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Lets divide the above problem in 3 parts, from bottom to top
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When C gives A & B the number of tractors each of them have and all have 24 tractors each.
.'. A had 24/2=12 and B had 24/2=12 tractors with them and C had 24 + (12+12) = 48 tractors.
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When B gives A & C the number of tractors each of them have
.'. A had 12/2=6 and C had 48/2=24 tractors and B had 12 + (6+24) = 42 tractors.
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When A gives B & C the number of tractors each of them have
.'. B had 42/2=21 and C had 24/2=12 tractors and A had 6 + (21+12) = 39 tractors.
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Thus initially tractors with company A=39, B=21, C=12
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