Question

3:4.
(b) The ratio of boys to girls in a school is 3:4
There are 120 more girls than boys.
How many students are in the school?​

Answer 1

Answer:

3:4 is the same as 3x:4x where 3x is the # of boys: 4x is the # of girls

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Equation:

4x = 3x+120

x = 120

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Ans: 3x+4x = 7x = 7*120 = 840

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Answer 2

No of boys = x

No of girls = 120+x

Then,

x/120+x =3/4

x = 360

Total no of boys = 360

Total no of girls = 360+ 120

= 480

Therefore, Total no of student in school = 840