Write down an expression for the OUTPUT when the INPUT is \(n\). [2]
Mark scheme (a)
Scheme
Marks
Comments
10x + 15 = 20 OR 2x + 3 = 4
B1
FT until 2nd error.
10x = 5 OR 2x = 1
B1
x = \(\dfrac{5}{10}\) OR x = \(\dfrac{1}{2}\) or equivalent
B1
Mark final answer. Allow an embedded answer but penalise −1 if contradicted by x ≠ ½ or 0·5.
Mark scheme (b)
Scheme
Marks
Comments
5(\(n\) − 3) or 5×( \(n\) − 3) or (\(n\) − 3)5 or (\(n\) − 3) × 5 or 5\(n\) − 15
B2
B1 for sight of \(n\) − 3 × 5 OR sight of 5 × \(n\) − 3. B0 for unsupported \(n\) − 15 OR unsupported 5\(n\) − 3. Allow ‘n = 5(n – 3)’ etc Mark final answer.
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