In triangle ABC and PQR,
( they are equal, measures 60° each )
( they are equal, measures 43° each )
so, the given triangles are Similar by
=》AA Similarity criterion
now, since the triangles are similar
the corresponding sides will be proportional,
=》

=》

=》

=》

(by cross multiplication)
=》

value of y = 22.5 cm