There are several combinations that will work. Here's one that works
using the side sum of nine.
By the Slice
Imagine a large round pizza that has just come out of the oven.
Using only three cuts, how can you divide this pie into eight equal
pieces? HINT: Don't worry about the mess!
your knife to cut the circular pie in half along its diameter. Then,
stack one half on top of the other. Divide the half circles with
a single cut through two layers. Now, stack all four wedge-shaped
sections together. A single cut through the middle of the stack
creates eight, equal-sized slices.
toothpicks in the pattern shown here. Remove six toothpicks and
leave only three complete squares behind. HINT: the squares can
be of any size.
You need to constuct a 3D pyramid structure with one of the original
triangles becoming the pyramid's base. The remaining three toothpicks
form the edges of the three vertical sides that rise up from the
Fill the 3-cup container with water. Pour this water into the 5-cup
container. Again fill the 3-cup container with water. Pour this
water into the 5-cup until it fills with water. The water volume
that remains in the 3-cup container is equal to exactly one cup.
Day 27. Since it doubles size every day, on the day prior to covering
the whole surface, the mold encrusted half the surface.