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Ben’s last jump was 3.75 metres long.

3.75 = f + (f/2)
f = Bens 1st jump

You need to find the value of ‘f’.

So
3.75 / 3 = 1.25
f1.5 / 3 = f/2

f/2 x 2 = f
1.25 x 2 = 2.5

f = 2.5

Ben’s first jump was 2.5 metres

Mia’s last jump was 1.20 metres high.

1.20 = f + (f/2)
f = Mia’s first jump

You need to find the value of ‘f’.

So
1.20 / 3 = 0.40
f1.5 / 3 = f/2

f/2 x 2 = f
0.40 x 2 = 0.80

f = 0.80

Mia’s first jump was 0.80 metres high.