The ratio you are told means that for every 5 pink salons, you have 7 yellow swans. This means that if you have more, you have to multiply both values. For example, if you had 10 pink salons, then you would have 14 yellow swans because 5 × 2 = 10 so therefore 7 × 2 = 14. In this case, 390 ÷ 5 = 78, so you need to multiply 7 by 78, which gives you 546 yellow swans in total. I hope this helps!
