Higher November 2020 Paper 5 Q10
10 Each day, Eve records how long it takes her to complete a puzzle.
On Friday, she took 50% less time than on Thursday.
On Saturday, she took 20% less time than on Friday.
On Saturday, she takes 36 minutes to complete the puzzle.
How many minutes did she take to complete the puzzle on Thursday?
Show your working. [5]
| Answer | Marks | Part marks and guidance | |
|---|---|---|---|
| 90 with correct working | 5 | M4 for 36 ÷ (0.8 × 0.5) oe or M3 for 0.4[\(t\)] [= 36] oe or M2 for 0.8 × 0.5 [\(t\)] [ = 36] oe OR M1 for 36 ÷ 0.8 oe or 36 ÷ 0.5 oe A1 for 45 or 72 M1 for their 45 ÷ 0.5 oe or their 72 ÷ 0.8 oe If 0 scored, SC1 for answer 90 with no working | “Correct working” requires evidence of at least M3 or M1A1M1 or alternate convincing method where [Thurs =] \(t\) A1 implies previous M1 |