Kisi sankhya mein se 15 ghatane par sankhaya main 80% ki ghatotri ho jati hain sankhaya Kya Hai
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let the number be x.
now, when there is a 80% reduction,
remaining numbers = x - 80x/100
=> x-15 = x - 4x/5
=> x-15 = x/5
=> 5(x - 15) = x
=> 5x - 75 = x
=> 4x = 75
=> x = 75/4
=> x = 18.75
now, when there is a 80% reduction,
remaining numbers = x - 80x/100
=> x-15 = x - 4x/5
=> x-15 = x/5
=> 5(x - 15) = x
=> 5x - 75 = x
=> 4x = 75
=> x = 75/4
=> x = 18.75
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