Calculate remaining for each ingredient, then the overall percentage.<br><br>\\(\begin{aligned}<br>\text{Coffee remaining} &= 20 \times 0.35 = 7 \text{ kg}<br>\\<br>\text{Tea remaining} &= 15 \times 0.60 = 9 \text{ kg}<br>\\<br>\text{Cocoa remaining} &= 25 \times 0.20 = 5 \text{ kg}<br>\\<br>\text{Total supplies} &= 20 + 15 + 25 = 60 \text{ kg}<br>\\<br>\text{Total remaining} &= 7 + 9 + 5 = 21 \text{ kg}<br>\\<br>\text{Percentage remaining} &= \frac{21}{60} \times 100\% = 35\%<br>\end{aligned}\\)<br><br>Final Answer: 35%