Question 389472
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Hi,         
Let x, (x + $112) and (x+ $306) represent Hunter, Mackensie and Grace amount.
Question states
 x + (x + $112) + (x+ $306) = $1312
solving for x
 3x + $418 = $1312
      3x = $894
       x = $298, Hunter's amount.  Grace paid $604

CHECKING our Anwer
 $298 + $410 + $604 = $1312