Higher November 2018 Paper 3 Q19
19 The length of a roll of ribbon is 30 metres, correct to the nearest half-metre.
A piece of length 5.8 metres, correct to the nearest 10 centimetres, is cut from the roll.
Work out the maximum possible length of ribbon left on the roll. [3 marks]
| Answer | Mark | Comments |
|---|---|---|
| 30.25 or 29.75 or 5.85 or 5.75 | B1 | |
| \(\text{their } 30.25 - \text{their } 5.75\) | M1 | Must be their max roll – their min cut their max must be (30, 30.5] their min must be [5.5, 5.8) |
| 24.5 | A1 |
Additional guidance
| 30.5 – 5.75 = 24.75 | B1M1A0 |