A number is first increased by 25% and then decreased by 10%. If the resulting number is 72, what is the original number?
Answer & explanation
Correct answer: option 3
25% = \(\frac{1}{4}\) & 90% = \(\frac{9}{10}\)
Let original number = 100x
ATQ,
100x × \(\frac{5}{4}\) × \(\frac{9}{10}\) = 72
X = 64
Hence , 64 is original number .