1. If 8 mathematics books are purchased for 3,600, how much will 18 of the same books cost?
2. A machine produces 30 tin cans in 4 minutes. Using the same rate, how many tin cans can it make in a 5-hour period?
3. Mr. Albano invested 10,000 in a stock that pays 700 dividend a year. At the same rate, how much will he invest so that he will earn 2,800 a year?
4. In an integrated school, the ratio of girls to boys is 5 to 3. How many girls are there if there are 750 boys?
5. If the repainting of corridor walls require 2 gallons of paint to finish 450 sq. m walls, how many gallons of paint will be needed to paint 2 025 sq. m walls?
