Asked by Holly
                There are 40 children on a bus, there are 12 more boys than girls, how many girls are there on the bus?
            
            
        Answers
                    Answered by
            Bosnian
            
    b = boys
g = girls
There are 40 children on a bus mean:
b + g = 40
There are 12 more boys than girls mean:
b = g + 12
b + g = 40
_______________________________
Remark:
You know:
b = g + 12
Replace this value in equation:
b + g = 40
_______________________________
g + 12 + g = 40
2 g + 12 = 40
Subtract 12 to both sides
2 g + 12 - 12 = 40 - 12
2 g = 28
Divide both sides by 2
g = 28 / 2 = 14
14 girls
    
g = girls
There are 40 children on a bus mean:
b + g = 40
There are 12 more boys than girls mean:
b = g + 12
b + g = 40
_______________________________
Remark:
You know:
b = g + 12
Replace this value in equation:
b + g = 40
_______________________________
g + 12 + g = 40
2 g + 12 = 40
Subtract 12 to both sides
2 g + 12 - 12 = 40 - 12
2 g = 28
Divide both sides by 2
g = 28 / 2 = 14
14 girls
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