How many White Flowers are there ?

In a bouquet there are three times as many White flowers as Blue flowers.

There are eight more Pink flowers than Blue and four less Purple than Pink.

There are nine Purple flowers in the bouquet.

How many White flowers are there?

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Answer is 15

White= 3* Blue
Pink= Blue + 8
Purple= Pink - 4
Purple=9, White=?

Pink=9+4=13 --> Blue= 13-8=5 --> White= 3*5= 15