john was thrice as old as tom 6 years ago . john will be 2 times as old as tom in 4 years . how old is tom today ?
j - 6 = 3 ( t - 6 ) , so j = 3 t - 12 j + 4 = 2 ( t + 4 ) ( 3 t - 12 ) + 4 = 2 t + 8 t = 16 the answer is c .
subtract(add(multiply(6, 2), multiply(4, 2)), 4)