Free notebooks were distributed equally among children of a class. The number of notebooks each child got was one-eighth of the number of children. Had the number of children been half, each child would have got 16 notebooks. Total how many notebooks were distributed ?  Pick one.
A) 256  B) 512  C) 432  D) 352  E) 640
Let total number of children be x.   Then, x *(1/8)x =(x/2)x 16   x = 64.   Number of notebooks =(1/8)x^2 =(1/8)x 64 x 64= 512.   Answer is 512.
<result>B</result>
Free notebooks were distributed equally among children of a class. The number of notebooks each child got was one-eighth of the number of children. Had the number of children been half, each child would have got 16 notebooks. Total how many notebooks were distributed ?