conditions were recorded as sunny or cloudy and warm or cold. Of 75 sunny days, 55 were warm. There were only 10 cold days How many days were warm

Question

Over a period of 100 days, conditions were recorded as sunny or cloudy and warm or cold. Let S denote sunny days and W warm days. Of 75 sunny days, 55 were warm. There were only 10 cold and cloudy days. Make a Venn diagram showing the numbers in each region of the diagram. How many days were warm

Answer 1

15

 

100 days - 55 that were warm and sunny - 20 that were sunny - 10 that ere cold and cloudy = 15