4MA0 Foundation June 2011 Paper 1 Q10
10 A box containing screws weighs 1.21 kilograms.
Each screw weighs 2.5 grams.
When empty, the box weighs 60 grams.
Work out the number of screws in the box.
(4)
| Scheme | Marks |
|---|---|
| 1210 seen | B1 |
| “1210” − 60 or 1150 | M1 |
| “1150” ÷ 2.5 | M1 |
| 460 | A1 |
| (4) | |
| (Total 4 marks) |
Notes
B1: Also award for 0.06
M1: for number with digits 121 − number with digit 6
M1: dep on first M1 for division by 2.5 or by 0.0025 as appropriate
A1: cao