Mohon bantuannya yg tau jawab yah.. PR no 8

A. eg/ef = eh/df
eg/7= 12/4
eg×4 = 12×7
4eg = 84
eg = 84/4
eg = 21

b. gh / ed = eg/ef
gh/5= 21/7
gh/7 = 21×5
7gh = 105
gh = 105/7
gh = 15