Problema Solution
Jan is 6 years older than his brother. He will be twice as old as his brother in 4 years. How old is Jan now?
Answer provided by our tutors
let
j = the present age of Jan
b = the present age of his brother
Jan is 6 years older than his brother
j = 6 + b
He will be twice as old as his brother in 4 years
j + 4 = 2(b + 4)
by solving the system of equations
j = 6 + b
j + 4 = 2(b + 4)
we find
j = 8 years
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