1MA0 Foundation November 2014 Paper 2 Q19
19 There are 240 counters in a bag.
The counters are green or yellow or blue.
\(\dfrac{3}{5}\) of the counters are green.
\(\dfrac{1}{4}\) of the counters are yellow.
Work out the number of blue counters in the bag. (4)
| Answer | Mark | Notes |
|---|---|---|
| 36 | 4 | M1 for \(\tfrac{3}{5} \times 240\) (= 144) M1 for \(\tfrac{1}{4} \times 240\) (= 60) M1 (dep on M2) for \(240 - (\text{‘}144\text{’} + \text{‘}60\text{’})\) A1 cao OR M1 for \(\tfrac{3}{5} + \tfrac{1}{4}\) or \(\tfrac{17}{20}\) oe M1 for \(1 - \text{‘}\tfrac{17}{20}\text{’}\) (= \(\tfrac{3}{20}\)) or \(\text{‘}\tfrac{17}{20}\text{’} \times 240\) (= 204) M1 (dep on M2) for \(\text{‘}\tfrac{3}{20}\text{’} \times 240\) or \(240 - \text{‘}204\text{’}\) A1 cao |