Question:In a 100 m race, A can beat B by 25 m and B can beat C by 4 m.In the same race, A can beat C by : 

A 21 m 
B 26 m 
C 28 m 
D 29 m 

+ Answer
C 

+ Explanation
A : B = 100 : 75 and B : C = 100 : 96%.

:. A : C `= (A/B xx B/C)`

       `= (100/75 xx 100/96)`

     `= 100/72 = 100 : 72.

:. A beats C by (100 - 72) m = 28 m.

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Irin Moni

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