In the trapezium ABCD, AB||DC and the tw...

In the trapezium `ABCD`, `AB||DC` and the two points `P` and `Q` are situated on the sides `AD` and `BC` in such a way that `PQ||DC` , if `PD=18cm`, `BQ=35cm`, `QC=15cm`, then the length of `AD` is.

A

`60cm`

B

`30cm`

C

`12cm`

D

`15cm`

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