Question 1068913
The ratio is 1:2
if that is to be expanded to 30 days, 1:2 represent 3 days' worth.
Multiply that by 10 to make it 30 days or a 10:20 ratio.
ten days were cloudy, 20 sunny.
You can also do it by doubling 2:4, then 3:6 4:8, until you get a pair that add to 30.