Foundation November 2017 Paper 3 Q22
22 There are only blue pens, green pens and red pens in a box.
The ratio of the number of blue pens to the number of green pens is 2 : 5
The ratio of the number of green pens to the number of red pens is 4 : 1
There are less than 100 pens in the box.
What is the greatest possible number of red pens in the box? (3)
| Answer | Mark | Notes |
|---|---|---|
| 15 | P1 | strategy to start the problem, eg 8 : 20 and 20 : 5 |
| P1 | process to solve the problem, eg \(\dfrac{5}{33} \times 100\) or 24 : 60 : 15 | |
| A1 | cao |