In what ratio must a grocer mix two varieties of pulses costing Rs 15 and Rs 20 per kg respectively so as to get a mixture worth Rs 16.50 per kg? `3\ :7` (b) `5\ :7` (c) `7\ :3` (d) `7\ :5`

Options

A. `3:7`
B. `5:7`
C. `7:3`
D. None of the above