Thursday, March 14, 2013

Chain Rule Q61


61. On a scale of map, 0.6 cm represents 6.6 km. If the distance between the points on the map is 80.5 cm, the actual distance between these points is:
[A] 9 km
[C] 190.75 km
[B] 72.5 km
[D] 885.5 km
Answer : D

Explanation :

Let the actual distnace be x km. Then,

More distance on the map, More is the actual distance (Direct Proportion)



0.6 : 80.5 :: 6.6 : x




0.6x = 80.5 x 66




x =
80.5 x 6.6
0.6





x = 885.5

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