1MA0 Foundation November 2012 Paper 2 Q19
19 It takes Tom 1 hour to lay 30 bricks.
He has to lay 180 bricks.
Tom starts to lay the bricks at 9 am.
He has half an hour break at 11 am.
He has another half an hour break at 1 pm.
What time should Tom finish laying the 180 bricks? (3)
| Working | Answer | Mark | Notes |
|---|---|---|---|
| \(180 \div 30 = 6\) \(9 + 6 + 0.5 + 0.5 = 16\) | 16:00 or 4pm | 3 | M1 for \(180 \div 30\) (= 6) or \(30 + 30 + \ldots\) to a total of between 150 and 210 exclusive M1 for \(9 + \text{`}6\text{'} + 0.5 + 0.5\) A1 for 16:00 or 4pm (accept 4 o’clock) OR M1 for 60 bricks used or 120 bricks left at 11 am M1 for 45 bricks used between 11 30 am and 1 pm or 75 bricks left at 1 pm A1 for 16:00 or 4pm (accept 4 o’clock) (SC B1 for 3 pm or 3 30pm if M0 scored) (SC B1 for 7 hours needed if M0 scored) |