There are twice as many girls as boys in the 4th grade classes at Joe's school. There are a total of 81 4th graders. How many boys and girls are there in the 4th?
G+B=81
G=2B
2B+B=81
3B=81
B=27
G=54
5670
which is the best estimate for the height of the average door inside a house
a.8 inches
b.8 yards
c.8feet
d.meters