Answer:
B
Explanation:
Since the triangles are similar then the ratio of corresponding sides are equal, that is
=
, substitute values
=
( cross- multiply )
16(3x - 9) = 336 ( divide both sides by 16 )
3x - 9 = 21 ( add 9 to both sides )
3x = 30 ( divide both sides by 3 )
x = 10 → B