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In a 100 m race, A can give B 10 m and C 28 m. In the same race B can give C:

Correct Answer: 20 m

Explanation:

A : B = 100 : 90.


 


A : C = 100 : 72.


 


B:C = B/A*A/C = 90/100*100/72 = 90/72


 


When B runs 90 m, C runs 72 m.


 


When B runs 100 m, C runs (72/90*100)m = 80m


 


 B can give C 20 m.


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