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Depends on what kind of weeds, but for most broad leaf weeds 20mls of roundup per litre of water is normally plenty. i.e. 200mls for 10 lits.
If you have couch that you are trying to kill you should triple the amount and possibly spray it twice.
Using the standard 10ml of Roundup per litre of water you can kill the grass without harming your vegetables. I would spray only on a nice calm day and use a piece of cardboard to block any over spray from reaching your veggies. Roundup works through absorption by leaves so transfer by groundwater is not a concern. Also remember more is not better with Roundup, too much just kills the leaves before they can absorb the toxin and kill the root.
If you have the concentrate (label reads Concentrate Plus), the amount of Roundup will depend on the plants you want to kill. Use 6 fl oz (12 tablespoons) for 1 gallon for most plants. If you have seedlings or easy to kill weeds, use 3 fl oz (6 tablespoons) per gallon.
The Super Concentrate may have a different rate. The labels are usually on the manufacturer's web site as PDFs.
Annual and perennial weeds can be controlled with a mixture of 6 fluid ounces of Roundup (12 tablespoons) per gallon of water. Small weed seedlings can be killed with half this strength: 3 ounces per gallon. When using Roundup Super Concentrate, mix 2.5 ounces (5 tbsp.) with a gallon of water to control most weeds and a half-strength solution for small weeds. Roundup Pro Concentrate is the strongest solution available. Spray a mixture of 2 ounces (4 tbsp.) on weeds and half that amount of concentrate on emerging plants. Since Roundup doesn't discriminate between weeds and other plants, use the least amount of herbicide possible to protect desirable vegetation.