IV. The ratio of the angles of a triangle is 3:4:5. 11. What is the difference of the biggest angle and the smallest angle? 12. How many degrees are there in the second angle? 13. What is the product of angle 1 and 2? 14. Two numbers are in the ratio 5:3. If the sum is 88, what is the difference of the two numbers. 15. If 4 farmers can plow a 3-hectare land in 6 days, how long can 8 farmers do it?​