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High jump. We worked this out by doubling the last jump.
Yes we can find another solution and here it is
1.20x3=3.60-1.20=2.40=2x1.20.
We prefer the first method we wrote because it is simpler than the second one.
The first jump reduces by half to the last jump to equal 1.20 metres so you need to double the last jump to equal the first jump.

Long jump. we worked this out by doubling the last jump.
there is a second way of doing it and here it is:
3.75x3=11.25-3.75=7.50.
We prefer the first method because it is much simpler.
the first long jump halfs by the end to equal 3.75 meters so you need to double it to get the first long jump.