Foundation November 2020 Paper 2 Q19
19 A clock chimes every 20 minutes.
A light flashes every 8 minutes.
The clock chimes and the light flashes together at 08:00.
How many times between 08:01 and 12:30 will the clock chime and the light flash together?
Show your working. [5]
| Answer | Marks | Part marks and guidance | |
|---|---|---|---|
| 6 with correct working | 5 | B2 for 40 (LCM) identified or M1 for multiples of 8 and 20 up to at least 40 AND B2 for indicates 40, 80, 120, 160, 200, 240 or B1 for [time =] 269 oe or 270 oe M1 for their time ÷ 40 oe If 0 scored, SC1 for answer 6 | “Correct working” requires evidence of at least B2 AND B1 or alternate convincing approach Eg attempts to count in 40 May be seen as clock times eg 0808, 0816, 0824,… 8.20, 8.40, 9.00,… Condone 1 error in either list FT other values Accept also if starting from 0801 Implies previous B2 Accept as times [0800], 8.40, 9.20, 10.00, 10.40, 11.20, 12.00 Condone [0801], 8.41, 9.21, 10.01, 10.41, 11.21, 12.01 eg Accept 4 hours 30 mins For M1 accept 4 correct multiples of 40 listed Condone 1 error FT other values Accept as times as above |