Question 1109642
<br>
Tutor stanbon has an error in his calculations; his answer is not correct.<br>
Tutor teachmath is right -- the given information does not produce whole number values for John's age.<br>
If Mary's age is m, then John's age is 2m-10.  The given information says<br>
{{{(2m-10)/40 = m/36}}}
{{{72m-360 = 40m}}}
{{{32m = 360}}}
{{{m = 360/32 = 45/4}}}<br>
That has to be a whole number.  Since it is not, the problem is flawed.