Plz help and I will give brainliest plz

Sara could list the factors of 18 and 30 and then find the greatest value that the lists have in common. The length of the longest equal-sized pieces that she can cut from both boards with no wood left over, is 3 inches. She will be able to cut 6 pieces from the 18-inch board and 10 pieces from the 30-inch board. She will have enough wood to cut 10 equal-sized pieces for her club project.

Hope this helps you Merry Christmas

it is a. 4.2 because 7.6-3.4 gets the remaining length of 4.2. i might be wrong but i am pretty sure this is the answer.