GCSE Maths Practice: direct-proportion

Question 3 of 10

Identify which calculations are in direct proportion.

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\( \begin{array}{l}\text{Which of the following calculations show direct proportion?}\end{array} \)

Select all correct options:

\( \text{If 4 apples cost £3.20, then 2 apples cost £1.60.} \) \( \text{If 5 books cost £15, then 10 books cost £30.} \) \( \text{If 6 chairs cost £90, then 3 chairs cost £45.} \) \( \text{If 8 pens cost £6, then 12 pens cost £9.} \)

Check unit cost consistency for each example.

Unit cost remains constant; multiply accordingly.