Below is an instruction that describes a task. Write a response that appropriately completes the request in Swahili. Please answer in Swahili.

### Instruction:
There are 50 marbles in a box which has a mixture of white, red and blue marbles. There were originally 20 white marbles and an equal number of red and blue marbles. Jack removes a number of marbles equal to double the difference between the number of white marbles and the number of blue marbles. How many marbles are left in the box?

### Response:
 Kulikuwa na mabulinge 20 meupe na idadi sawa ya mabulinge nyekundu na buluu, hivyo kulikuwa na mabulinge 20 + 0 + 20 = 40 nyekundu na buluu.
Tofauti kati ya idadi ya mabulinge meupe na mabulinge buluu ni 20 - 20 = 0.
Mara mbili ya tofauti ni 0 * 2 = 0.
Kulikuwa na mabulinge 40, hivyo Jack aliondoa mabulinge 0 ambayo yalibaki 40 - 0 = 40.