A woman spend half of her money on book and give 1 rupee to a man,than she sped half of rest money and give 2 rupee to a man,than spend half rest money give3 rupee to a man.at last 1 rupee left.what amound he have at first
She had one rupee left and spent:
1 (what she had left) + 3 + 2 + 1 = ?
That is half the money she started with, so double that (x2) to find out how much she started with.