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Alex thinks of a number. he adds 18 then divides it by 2. he gets the same answer that he would have if he had multiplied the original number by 5.

Alex thinks of a number. he adds 18 then divides it by 2. he gets the same answer that he would have if he had multiplied the original number by 5.
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Alex thinks of a number. he adds 18 then divides it by 2. he gets the same answer that he would have if he had multiplied the original number by 5.

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User Rrd
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Let the original number for the x. Form the equation: (x+18):2=5x. Decide it: x+18=10x; x-10x=-18; -9x=-18; x=2. Answer: x=2.
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User Jurij Pitulja
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