answer:
if you multiply the 2 sides of the ratio by a number it will give you an equivalent ratio
5:8 = 10:16 multiplying by 2
5:8 = 15:24 multiplying by 3
5:8 = 20:32 multiplying by 4
5:8 = 25:40 multiplying by 5
5:8 = 30:48 multiplying by 6
5:8 = 35:56 multiplying by 7
and so on ...