Question

Mary competes in a long jump con tion. Her first jump is 4.8 m.

Her best jump is 10% more than this. However, her best jump is 20% lower than the winning jump.

Work out the length of the winning jump.

Answer 1

competition*

if it helps, I know that the answer is 6.6 but I don’t quite understand it. Thank you for the help.

Answer 2

her best jump = 4.8 * 1.10 = 5.28
winning jump is 5.28/0.80 = 6.60

Answer 3

10% = 10 / 100 = 0.1

20% = 20 / 100 = 0.2

Her best jump is 10% more than this means: her best jump is

4.8 + 10% more than this = 4 8 + 0.1 • 4.8 = 4.8 • 0.48 = 5.28 m

Her best jump is 20% lower than the winning jump means her best jump =

the winning jump - 20% of the winning jump =

the winning jump - 0.2 of thenwinning jump =

0.8 of the winning jump

0.8 of the winning jump = 5 28 m

Divide both sides by 0.8

the winning jump = 5 28 m / 0.8 = 6.6 m

Answer 4

Thank you very much! This is clear now :)

Answer 5

6.6