Question 1135480
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Since Maria is 12 years older than Mark,


last year she was 12 years older than Mark  &nbsp;<U>AND</U>&nbsp;  twice as old as Mark &nbsp;&nbsp;&nbsp;&nbsp;(both at the same time !)


Then it is clear that the last year Maria was &nbsp;24 &nbsp;years old, &nbsp;while Mark was &nbsp;12&nbsp; years old at that time.


Now add &nbsp;1&nbsp; year to &nbsp;24&nbsp; and &nbsp;12, &nbsp;and you will get the &nbsp;<U>ANSWER</U>.
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&nbsp;&nbsp;&nbsp;&nbsp;Solved &nbsp;(or almost solved, &nbsp;leaving a small gap for you to fill it . . . )