The sum of a number and its half is 42. The number is:
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Let the another number be-x
so another number is half means-x/2
so,x+(x/2)=42
>multiply 2 with both sides
>(2x+x)=84
>3x=84
>x=84/3
>x=28
>28+(28/2)=42
>Hence proved
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