The ratio of boys to girls is 3 to 4. If there are 135 boys, how many girls are there?
A . 150
B. 180
c. 210
D. 240
we use formula B=bx÷(b+g)
G=gx÷(b+g)
Where B is total boys and G for total girls b,g are ratios of boys and girls
Now
We use formula for total number of students in class
B=bx÷(b+g)
B=135
b=3
g=4
Now put the values
135=3x÷(3+4)
135=3x÷7
3x=945
x=945÷3
x=315
Hence the total number of students are 315
Where 135 boys
Then girls will be
G=x-B
G=315-135
G=180
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