So I've tried this multiple times and can't get any of the given answers... help? ?

Washington High School has a total of 90 boys and girls who play sports. If the number of boys is 10 more than three times the number of girls, how many girls play sports at this high school?

20
30
70
80

Question

So I've tried this multiple times and can't get any of the given answers... help? ?

Washington High School has a total of 90 boys and girls who play sports. If the number of boys is 10 more than three times the number of girls, how many girls play sports at this high school?
 	
	20
	30
	70
	80

anonymous · Answer

B =3G +10
B+G=90
B=90-G
G=20

anonymous · Answer

x = girls
3x + 10 = boys
4x + 10 = 90
4x  = 80
x = 20
20 Girls'
70 Boys

anonymous · Answer

first option 20