Dermot has 240 counters. The counters are either red, or blue, or yellow or green.
15% of the counters are red.
25\displaystyle \frac{2}{5}52 of the counters are blue
The ratio of yellow counters to green counters is 3:1
Work out the number of yellow counters Dermot has.
Practise OCR GCSE Maths Ratio with exam-style questions for Foundation and Higher tier. 93 questions, matched to the OCR GCSE Maths (J560) specification and written in the written papers style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.