A piece of butter has a mass of 250 g. <br>A jar of jam has a mass of 340 g. <br>What is the mass of 3 jars of jam and a piece of butter? Give your answer in kilograms and grams. <br> The mass of 3 jars of jam and a piece of butter is <input min="0" type="number" id ="imp3pg146q6_1" class="lineinput" placeholder="?" /> kg <input min="0" type="number" id ="imp3pg146q6_2" class="lineinput" placeholder="?" /> g.