School attend 792 children, boys and girls ratio is 4:5. How many more girls go to school (than boys)?

Correct result:

d =  88


x+y = 792; 5x=4y; d = y-x

x+y = 792
d = y-x

x+y = 792
5x-4y = 0
d+x-y = 0

d = 88
x = 352
y = 440

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