SSC CGL 6 Aug 2017 Shift 1 Paper

Question : 55 of 100

Marks: +1, -0

What number should be added to each of the numbers 55,100, 65 and 116, so that the resulting numbers are in continued proportion?

Solution:

Let a = 55, b = 100, c = 65 and d = 116
Required number

={bc-ad}/{(a + d ) - ( b + c)}

{100 ×65 -55 × 116 }/{(5 5 + 1 1 6 )-(1 0 0 + 65) }

{6500-6380}/{171-165 }

120/6=20

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