Let's set up some variables:
- b: # of boys
- g: # of girls
Let's set up some equations based on the informative given:
- boys to girls ratio ⇒ 1: 12
(Mathematical form) g = 12b
(Mathematical form) g = b + 77
Let's put the equation together:
g = 12b -- equation 1
g = b + 77 -- equation 2
(equation 2)'s value of g into (equation 1)
12b = b + 77
11b = 77
b = 7
There are 7 boys.
Answer: 7 boys
Hope that helps!
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