<p>This is the first problem in a section. It is considered "easy". For the life of me, I can't get it. Help?</p>
<p>There is the same number of boys and girls on a school bus when it departs from school. At the first stop, 4 boys get off the bus and nobody gets on. After the first stop, there are twice as many girls as boys on the bus. How many girls are on the bus?</p>
<p>a) 4
b) 6
c) 8
d) 12
e) 16</p>
<p>Thanks!</p>
<p>You need to find a number, which when you subtract 4, is equal to 2 times the original number. You can just plug in the answers. 8 works.</p>
<p>Let the number of girls = x
let the number of boys = x</p>
<p>after the first stop the number of girls is still x and the number of boys is x-4</p>
<p>because there are twice as many girls than boys after the first stop, </p>
<p>x=2(x-4)
x=2x-8
8+x-x=2x-x-8+8
8=x</p>
<p>thus therE are 8 girls on the bus.</p>