Question 3318
define something first...


Let x be the "number"


so, write down the English version as maths...


{{{((x+60)/3) = ((x+84)/15)}}}


Now just re-arrange and solve, as: {{{(15(x+60)/3) = x+84}}}


{{{5(x+60) = x+84}}}
{{{5x+300 = x+84}}}
4x+300 = 84
4x = -216
x = -54


jon