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

### Instruction:
There are 30 students in Ms. Leech's class. Twice as many girls as boys are in the class. There are 10 boys in the class and each boy today brought 5 cups for science activity class as Ms. Leech had instructed. If the total number of cups brought by the students in the class is 90, how many cups did each girl bring?

### Response:
Since there are 10 boys in the class, the boys brought 10*5 = <<10*5=50>>50 cups.
The number of girls in the class is 30-10 = <<30-10=20>>20
If the total number of cups brought by the students in the class is 90, the girls brought 90-50 = <<90-50=40>>40 cups.
Since the number of girls in the class is 20, each girl brought 40/20 = <<40/20=2>>2 cups.
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