@mashable 19 is 2 more than 17, 65 is two 2 than 63. Doesn't seem that difficult.
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@mashable well it's hard if you use algebra but easy if you use separate addition and subtraction equations. Should be bonus or somethingThanks. Twitter will use this to make your timeline better. UndoUndo
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@mashable Perhaps it stumped really, really stupid parents. Not much of a story.Thanks. Twitter will use this to make your timeline better. UndoUndo
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@mashable This looks like pre-algebra. I wouldn't give it to a 7 year old but maybe an 8 or 9 year old.Thanks. Twitter will use this to make your timeline better. UndoUndo
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@mashable That is very easy. We did lots like these in 1st grade.Thanks. Twitter will use this to make your timeline better. UndoUndo
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@mashable it would test the proficiency with the operations, without the need for the abstract thinking to go backwards that a 7yo may lackThanks. Twitter will use this to make your timeline better. UndoUndo
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@mashable for a 7 years old, I would make the question the other way around - start with the 65, 19 get out, 17 get in, how many you have?Thanks. Twitter will use this to make your timeline better. UndoUndo
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@mashable I may see that the question is a bit too hard for a 7 years old, because you need to think backwards to find the solution...Thanks. Twitter will use this to make your timeline better. UndoUndo
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@mashable its a simple net change of 2... so...not that hard five people walk in a room. 4 leave. how many are there. seriously.Thanks. Twitter will use this to make your timeline better. UndoUndo
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@mashable really? U.S. parents only?Thanks. Twitter will use this to make your timeline better. UndoUndo
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@mashable no it doesn't !Thanks. Twitter will use this to make your timeline better. UndoUndo
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