**Helpful Links**

**Question**

20) Martin did this question.

Here is how he answered the question.

Martin’s answer is wrong.

a) Find Martin’s mistake.

a) Find Martin’s mistake.

**[1 mark]**

Sian did this question.

Here is how she answered the question.

Sian’s answer is wrong.

b) Find Sian’s mistake.

b) Find Sian’s mistake.

**[1 mark]**