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There are 240 children at a party. The ratio of the number of the number of boys to the number of girls at the party is 3:1 How many boys are there at the party?

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Shinalcantaraviz
Let 'x' be the factor such that you'll have the ratio as 3x:x
Since the total number is 240 then you'll have it as:
3x + x = 240
4x = 240
x = 60
For the number of boys:
3x = 3(60)
     = 180
For the number of girls:
x = 60
Therefore there are 180 boys and 60 girls.
Leocyllviz
3:1= 240
4n = 240
n = 60
3*60 = 180