Question 439445
Let say John has x dollars. If he spend $16 per day the money finish for x/16 days

If he spend $12 per day the money finish for (x/12)-3 days. Write the equation:

{{{x/16=(x/12)-3}}}, multiply both sides by 48, {{{3x=4x-48*3}}} => {{{x=144}}}.

Answer:John has $144.