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We can set up a proportion to figure out how many laps out of 200 laps is 57% out of 100%

Cross multiply



The answer is 114 laps.
£9 - 90p = £8.10
2 Pencils = 48p
3 Pens = £1.11
3 Sharpeners = £2.31
All together = £3.90
£8.10 - £3.90 = £4.20
£4.20 / £1.40 = 3
Answer = 3 Notebooks
Answer:
The answer to the above question is x = -5