Question 198673
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One (1) cake layer with 9" dia.: {{{A[C1]=(pi)(d/2)^2=(pi)(9/2)^2=red(20.25(pi)in^2)}}}.


There are 6 layers, {{{6(A[C1])=6(20.25(pi))=121.5(pi)in^2=green(381.70in^2)}}}{{{green(Total_Area)}}}


So,{{{A[C6]/(Area/batch)=(121.5(pi)cross(in^2))(batch/60cross(in^2))=6.36batches}}} ---> close to <font color=blue>7 batches</font> (Answer)


Check,
{{{(Area/batch)(batches)=(60in^2/cross(batch))(highlight(blue(7))cross(batches))=420in^2}}}, => more than enough to cover the total Area {{{green(381.70in^2)}}}


Thank you,
Jojo</font>