Girls-->180+210=390Oh Dear wrote:Can anyone help?

There were 180 girls and 150 boys in the Arts Theatre and 210 girls and 560 boys in the School Hall at first. After some boys and girls moved from the School Hall to the Arts Theatre, there were an equal number of boys and girls in the Arts Theatre and thrice as many boys as girls in the School Hall.

How many boys and how many girls were moved from the School Hall to the Arts Theatre?

Boys-->150+560=710

Arts Theatre Boys:Arts Theatre Girls

1u:1u

School Hall Boys:School Hall Girls

3p:1p

1u+3p=710

1u+1p=390

2p=710-390

=320

1p=160

1u=390-160

=230

230-180=50

230-150=80

80+50=130

Ans: 130 boys and girls