28. Harris invested $45,000 in two different ventures, a car-cleaning machine and a
video mat. The yearly return on the video mat was 12% and the yearly return on the
car-cleaning machine was 8%. If the total return was $4,000, how much did Harris
invest in the video mat?
15. Roy is now 4 years older than Erik and half of that amount older than Iris. If in 2
years, Roy will be twice as old as Erik, then in 2 years what would be Erik’s age
multiplied by Iris’s age?
16. A cruise ship traveled for 3 hours. In the first hour, the ship sailed at a speed of 25
Km/h, which was 25% faster than the speed in the third hour. In the middle hour the
ship sailed at the average speed of the first and third hours. What was the total istance
of the ship during the 3 hours of sailing?
15. A train traveled for three hours. In the first hour the train traveled 86 miles, which
was 25% farther than it traveled in the first hour. In the third hour the train traveled at
a speed of 120 miles per hour for 20 minutes. What is the total distance that the train
just one more month for exam...