1MA0 Foundation November 2016 Paper 1 Q19
19 There are some red counters and some yellow counters in a bag in the ratio 1 : 5
(a) What fraction of the counters in the bag are red? (1)
There are 20 yellow counters in the bag.
(b) Work out the number of red counters in the bag. (2)
Janet puts some more red counters into the bag.
The ratio of the number of red counters to the number of yellow counters is now 1 : 2
(c) How many red counters does Janet put into the bag? (2)
| Answer | Mark | Notes |
|---|---|---|
| \(\frac{1}{6}\) | 1 | B1 cao |
| Answer | Mark | Notes |
|---|---|---|
| 4 | 2 | M1 for \(20 \div 5\) (= 4) Allow build up method to 4 lots of 1 : 5 A1 cao |
| Answer | Mark | Notes |
|---|---|---|
| 6 | 2 | M1 for a full method to find the number of red counters needed eg \(20 \div 2 - \text{``}4\text{''}\) A1 ft from (b) |