algebra
the sum of the age of a girl and her brother is 26 year 3 years ago her age was 4 time the age of her brother. find their present age?
asked by
kiran

g = girls age
b = boys age
g + b = 26 Subtract b to both sides
g + b  b = 26  b
g = 26  b
g  3 = 4 ( b  3 )
26  b  3 = 4 ( b  3 )
23  b = 4 b  12 Add b to both sides
23  b + b = 4 b + b  12
23 = 5 b  12 Add 12 to both sides
23 + 12 = 5 b  12 + 12
35 = 5 b Divide both sides by 5
35 / 5 = 5 b / 5
7 = b
b = 7
g = 26  b
g = 26  7
g = 19
posted by Bosnian
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