I would be happy to help! First you need to find the total amount of trees by adding up all of the different trees: 420+160+300=880 Next you need to divide the amount of oak trees by the amount of trees in the woods: 160÷880=0.182 (rounded) Finally to find the precentage we need to multiply the 0.182 by 100 to get the precentage of 18.2% oak trees.