A and B entered into partnership with capitals in the ratio 4 : 5. After 3 months, A withdrew ¹/₄ of his capital and B withdrew ¹/₅ of his capital. The gain at the end of 10 months was Rs. 760. A's share in this profit is:

Explanation:-

$$\eqalign{ & A:B \cr & = \left[ {4x \times 3 + \left( {4x - \frac{1}{4} \times 4x} \right) \times 7} \right]:\left[ {5x \times 3 + \left( {5x - \frac{1}{5} \times 5x} \right) \times 7} \right] \cr & = \left( {12x + 21x} \right):\left( {15x + 28x} \right) \cr & = 33x:43x \cr & = 33:43 \cr & \therefore {\text{A's}}\,{\text{share}} = Rs.\,\left( {760 \times \frac{{33}}{{76}}} \right) \cr & = Rs.\,330 \cr}$$