1MA0 Foundation June 2015 Paper 1 Q20
20 Rachel bought a packet of 60 balloons.
\(\dfrac{1}{10}\) of the balloons were yellow.
\(\dfrac{3}{5}\) of the balloons were red.
The rest of the balloons were blue.
How many of the balloons were blue? (3)
| Answer | Mark | Notes |
|---|---|---|
| 18 | 3 | M1 for \(\tfrac{1}{10} \times 60\) (= 6) or \(\tfrac{1}{10} + \tfrac{3}{5}\) or \(\text{``}\tfrac{7}{10}\text{''}\) oe M1 for \(\tfrac{3}{5} \times 60\) (= 36) or \(1 - \text{``}\tfrac{7}{10}\text{''}\) (= \(\tfrac{3}{10}\)) or \(\text{``}\tfrac{7}{10}\text{''} \times 60\) (= 42) A1 cao |