When a number is subtracted from the number 8 12 and 20 the remainders are in continued proportion F...........

Quantitative Aptitude ( CCS) Number System

When a number is subtracted from the number 8,12 and 20, the remainders are in continued proportion, Find the number ?

8-x / 12 –x = 12-x /20 –x
(8-x)(20-x) = (12 – x)(12 –x )
160 – 8x – 20x + x²= 144 – 12x – 12x + x²
4x = 16
x = 4

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