Half as many means that you have one half less of something.
For example:
"Jack has 10 apples and Peter has half as many as Jack."
So Peter has 5 apples.
But "Half as many again" is not the same. This means an EXTRA half.
"Jack has 10 apples and Peter has half as many again."
This means that Peter has 15 apples.
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it depends onn the amount that there is, then take away half, that is half as many
if by two and a half you mean two and a half cm than its bout 1 inch xx
7.5/15 = 1/2, so there are 7.5 fifteenths in one half.
If u mean 5ft 6.5inches then its answer is :178.51cm
The equation would be x=y/2 or y=2x
It could mean a cube tat has been cut into a half so that it is a cuboid. Or, it could mean a cube, each of whose sides is half a unit.