Answers

2015-12-12T14:18:18+08:00
28 - 4 = 24
24 ÷ 2 = 12
12 + 4 = 16
12 : 16
when reduced, it will be 3 : 4

So the answer is 3:4
1 5 1
You did not identify which is the quantity for girls and for boys.  The ratio asked is specifically girls to boys, so the ratio is 4:3.
2015-12-12T16:34:09+08:00
Lets represent:
x=number of boys
x+4=number of girls

Since the problem involves addition since there is an algebraic expression of "more" then:

x+x+4=28
Now add like terms
2x+4=28
Subtract both sides by 4
2x=24
Divide both sides by 2
x=12

There are 12 boys, and 16 girls. The ratio would be:
12:16 
or simply:
3:4

Hope this helps =)
0
The ratio asked is specific: girls is to boys, so it's the other way around. 4:3.  Fortunately, you identify which quantity is for boys, and for girls. :-)