What is this question 1/2 x = 5

Which shows the correct solution of the equation 1/2a+2/3b=50, when b=30?

Given: ae ≅ ce ; de ≅ be prove: abcd is a parallelogram. we have that ab || dc. by a similar argument used to prove that △aeb ≅ △ced, we can show that △ ≅ △ceb by. so, ∠cad ≅ ∠ by cpctc. therefore, ad || bc by the converse of the theorem. since both pair of opposite sides are parallel, quadrilateral abcd is a parallelogram.

Type the correct answer in the box. use numerals instead of words. if necessary, use / for the fraction bar.