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Let the number is x
Given, x/5 + 30 = x/4 - 30
=> x/5 + 30 + 30 = x/4
=> x/5 + 60 = x/4
=> x/4 - x/5 = 60
=> (5x - 4x)/20 = 60 {LCM od 4 and 5 is 20}
=> x/20 = 60
=> x = 60 * 20
=> x = 1200
So, the number is 1200