Well, honey, cutting a cake into 12 pieces is as easy as pie. Just make two cuts to create four equal pieces, then make three more cuts perpendicular to those to create a total of 12 slices. It's not rocket science, just grab a knife and get slicing!
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There are 4 fourths in one whole. Think of a cake cut into 4 pieces. Now imagine 4 cakes, each cake being cut in 4 pieces. There would be a total of 16 pieces of cake.
Cut a round cake in eight equal sized wedge shaped pieces with four vertical cuts, then make one horizontal cut through the center of the cake to equal sixteen pieces.It's slightly more tricky if you are only allowed to cut the horizontal cross-section of the cake (treat the cake as a circle). In this case, first divide the cake with one cut (2 pieces), then cut it again so that it intersects the first cut (4 pieces), then cut it a third time so that it intersects both cuts previously made, at different points (7 pieces), then let the fourth cut intersect all three cuts so far at different points (11 pieces), and let the fifth and final cut intersect all four cuts at different points (16 pieces total).
Total volume of the cake=12*9*2=216 cubic inch. If the cake is cut into 18 equal parts, then each part will be of volume (216/18)=12 cubic inch.
87/100 is larger than 13/100. Think of this as you have a (very large) cake cut into 100 pieces. Would you have more cake if you ate 87 pieces of cake or 13 pieces of cake?
Cut the cake lengthwise and then crosswise. Stack the four pieces and then cut crosswise at one third the length and again at two-thirds the length. Done!