We notice that 47+43=90 we know that all angles are adding to 180 since they are both right triangles, one angle is 90 therefor the angles of both triangles are 47,43,90 that means the triangles are similar and their sides are in the same ratio
you have to calculate the SID number and then take it upon yourself and divided X it's actual number and then there's a chance and the answer would be c.72
