At a lake there were 35 turtles. The ratio of the number of turtles to the number is ducks was 5:8. After some ducks arrived the ratio became 3:5. How many ducks arrived?

The bottom of ignacio's desktop is 74.5cm from the floor. ignacio's sits in his adjustable chair, and the tops of his legs are 49.3cm from the floor. each clockwise rotation of the knob on the chair raises ignacio's legs by 4.8cm. write an inequality to determine the number of clockwise rotations, r, ignacio could make with the knob without his legs touching the desk