1MA0 Foundation November 2014 Paper 1 Q21
21 Suha has a full 600 ml bottle of wallpaper remover.
She is going to mix some of the wallpaper remover with water.
Here is the information on the label of the bottle.
| Wallpaper remover 600 ml |
|---|
| Mix \(\dfrac{1}{4}\) of the wallpaper remover with 4500 ml of water |
Suha is going to use 750 ml of water.
How many millilitres of wallpaper remover should Suha use?
You must show your working. (4)
| Answer | Mark | Notes |
|---|---|---|
| 25 | 4 | M1 for \(600 \div 4\) (= 150) M1 for \(4500 \div \text{``}150\text{''}\) (= 30) M1 for \(750 \div \text{``}30\text{''}\) A1 for 25 with supporting working OR M1 for \(4500 \div 750\) (= 6) M1 for \(600 \div 4\) (= 150) or \(600 \div \text{``}6\text{''}\) (= 100) M1 for \(\text{``}150\text{''} \div \text{``}6\text{''}\) or \(\text{``}100\text{''} \div 4\) A1 for 25 with supporting working OR M1 for \(4500 \div 750\) (= 6) or \(750 \div 4500\) (= \(\tfrac{1}{6}\)) M1 for \(\text{``}\tfrac{1}{6}\text{''} \times \tfrac{1}{4} = \tfrac{1}{24}\) M1 for \(\text{``}\tfrac{1}{24}\text{''} \times 600\) A1 for 25 with supporting working |