1. There were ninety days in the season. if the ratio of rainy days to clear days was 2 to 13, how many rainy days were there?
2. Write all prime factors of 273
3. Find the greatest common factor of 6a^3b^2c^10+20c^10-8a^3b^2c^9
4. The congregation in the church consisted of adults and children in the ratio of 3 to 7. If there were 105 adults, how many children were there?
