###Human: In the park, the first rose bush has 12 red flowers.  The second rose bush has 18 pink flowers.  The third rose bush has 20 yellow flowers.  The fourth rose bush has 8 orange flowers.  For her vase, Lorelei picks 50% of the red roses, 50% pink roses, 25% of the yellow roses, and 25% orange roses. How many roses are in her vase?, ### Assistant: The number of red roses Lorelei picks is 12 x 50% = 6 roses.
The number of pink roses Lorelei picks is 18 x 50% = 9 roses.
The number of yellow roses she picks is 20 x 25% = 5 roses.
The number of orange roses she picks is 8 x 25% = 2 roses.
The total number of roses in her vase is 6 + 9 + 5 + 2 = 22 roses. 
 So the answer is :  22