Musa is 12years older than his sister Bisi,in 4years time ,Musa will be twice as old as bisi .what is their present age ?
Musa is now m years old. So, we have
m+4 = 2(m-12 + 4)
Musa is now 20, so Bisi is 8
In 4 years, they will be 24 and 12
m+4 = 2(m-12 + 4)
Musa is now 20, so Bisi is 8
In 4 years, they will be 24 and 12