A number is decreased by 10% and then incrcased by 10%. The number so
obtained is 10 less then the original number. What was the original number?
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Answer:
let x be the original no.10% of x is x/10
=x-x/10=9x/10
next it is given that 10% of the new no. is added
9x/10+9x/100=99x/100
it is stated that the no. obtain is 10 less than original no.
therefore, x-10=98x/100
100x-99x=1000
x=100
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