Gold Fish Mystery Math

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  • Thank you so much for coming today. I have a problem that none of my employees can solve. If you solve it then you get a free goldfish. DEAL.
  • Our pet store had x goldfish at the beginning of the month. On the first week we sold 10 goldfish. On the second week, we sold 1/2of the remaining goldfish. On third week 4 goldfish were returned. So how many goldfish were at the beginning if there were 10 left after week 3.
  • First let me tell you the problem
  • So here is the plan
  • First step: simplify x-6-1/2(x-10) = 10 Second step: Multiply both sides by 2  2x-12-(x-10) = 20 Step 3: Simplify 2x-12-x+10 = 20 Step 4: further simplification x-2 = 20 Step 5: Solving  for x X = 22
  • Hi there again. So lets try solving this with an equation. lets see if this equation works. x-10-1/2 (x-10)+4= 10
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