document.write( "Question 846972: In a group of children, each child gives one gift to the other.If total gifts are 90, then find the number children in the group. \n" ); document.write( "

Algebra.Com's Answer #510040 by ewatrrr(24785) $\"\"$ $\"About$

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document.write( "Hi,
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document.write( "each child gives one gift to the other 
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document.write( "total gifts are 90
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document.write( "  n(n-1) = 90
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document.write( " n^2 - n = 90
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document.write( " n^2 - n - 90 = 0     (Tossing out the negative solution for unit measure)
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document.write( "(n-10)(n+9) = 0 ,   n = 10 children in the group
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