15 points and brainliest the mass of 4.5 cm3 of iron and 8 cm3 of copper is equal to 101.5g. the mass of 3 cm3 of iron is 6.8g greater than the mass of 2 cm3 of copper. find the density of iron and the density of copper. technological advances in farming made it possible to increase the crop of potatoes from 1 acre by 4 tons. as a result, from a field of 320 acres 640 tons of potatoes more were collected than before from a field of 400 acres. how many tons of potatoes were collected before the new methods and how many after the introduction of the new technology? i am having trouble with both questions. with both!