Quantitative Aptitude :: Percentage - Discussion

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Explanation:
35% of 30 = 25% of x + 1
35/100 * 30 = 25/100 * x + 1
7/20 * 30 = x/4 + 1
21/2 = x+4/4
21 = x+4/2
42=x+4
x = 38