Represent 7494

There are 12 more than boys, and the boys represent 30% of all pupils in the class. Find how many girls are in the class.

Correct answer:

d =  21

Step-by-step explanation:

d = 12 + c
c = 0.30 • (c+d)

c-d = -12
0.7c-0.3d = 0

c = 9
d = 21

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