In a bag there are blue sweets, red sweets and yellow sweets.
The number of blue sweets is four times the number of yellow sweets.
The number of red sweets is half the number of yellow sweets.
Find the percentage of sweets in the bag that are yellow.
15 exam-style questions on Oxford AQA IGCSE Maths Writing and Simplifying Ratio. Each one has a worked solution and a mark scheme showing where the marks go.