1. A car travels 560 km in 4 days. At this rate, how far will it travel in 15 days? * 2. If 20 men can build a house in 30 days, how many men can do it in 24 days
3. The sum of two numbers is 80. Find the larger number if the ratio is 3:5. *
4. A team won 10 out of 12 games played. At the same rate, how many games did they play if they won 25 games? *
5. An army camp has provisions for 400 men for 15 days. How long will the provisions last if only 300 men are sent into the camp? *

Okay so for every triangle has three angles that always add up to 180 degrees. and to tell the difference between whether they are secure, right or obtuse is that acute: has one angle that is less than 90 degrees. right triangle means there is at least one angle that is exactly 90 degrees. and an obtuse angle has an angle that is bigger than 180 degrees. i’ll do #13 as an example: 13. 40 and 50 so if every triangle has 180 degrees 40+50= 90 degrees then180-90= 90 degrees so the third angle is 90 degrees and because this triangle has a 90 degree angle it means it is a right triangle

The answer would be (8+7z)/5