Go to https://whiterosemaths.com/homelearning/year-6/ and watch the video - Week 2 Step 7 called ratio and proportion problems.
Have a go at answering the questions https://wrm-13b48.kxcdn.com/wp-content/uploads/2020/homelearning/year-6/Lesson-2-Y6-Spring-Block-6-WO7-Ratio-and-proportion-problems-2019.pdf