Lista de exercícios do ensino médio para impressão
A workman makes ${\small U\$\,}$4000,00 each 16 days of hard work; how much money is he going to make working hard 20 days?


answer: ${\small U\$\,}$5000,00
A small spur gear with 30 teeth drives another gear with 25 teeth. When the first gear has made 450 revolutions, how many revolutions has the second one made?


answer: 540 revolutions
A tap can fill a tank in 16 hours. How much time is needed for five identical taps to fill the same tank?


answer: 3 hours and 12 minutes
A machine working 6 hours each day produces 3000 hair clips in 5 days. How many hair clips will be produced if the machine is working 4 hours each day during 8 days?


answer: 3200 hair clips
Other math tests: rule of three