4MA0 Foundation June 2017 Paper 2 Q19
19 There are 6 batteries in a small packet of batteries.
There are 9 batteries in a large packet of batteries.
Chow buys \(m\) small packets of batteries and \(g\) large packets of batteries.
The total number of batteries Chow buys is \(T\).
Write down a formula, in terms of \(m\) and \(g\), for \(T\).
(3)
| Scheme | Marks |
|---|---|
| \(T = 6m + 9g\) | B3 |
| (3) | |
| (3 marks) |
Notes
B3: Or \(T = 3(2m + 3g)\) [award B2 if \(T = 6m + 9g\) is incorrectly simplified](condone \(T = 6 \times m + 9 \times g\))
if not B3 then
B2 for \(T = 6m + kg\) or \(T = km + 9g\) (\(k\) may be zero) or \(6m + 9g\)
if not B2 then
B1 for \(6m\) or \(9g\) or \(T = am + bg\) (where \(a \neq 0\) or 6 and \(b \neq 0\) or 9)