Razão e Proporção no ENEM | Questões resolvidas

Want to learn how to solve the Ratio and Proportion questions that appear on the ENEM (National High School Exam)? In this Math video lesson, you'll learn how to solve ratio and proportion questions. I'll also cover some questions involving the compound rule of three. To download the PDF material for practice, click the link below. SUBSCRIBE TO THE CHANNEL AND LIKE to strengthen your skills. List link: https://thyagoaraujo.com/listas-de-qu... Study with me and succeed in Math. ONLINE MATHEMATICS PLATFORM: https://www.thyagoaraujo.com Follow us on social media: ► Instagram:   / escoladenumeros   ► Twitter:   / escoladenumeros   Solved questions from previous ENEM exams 01. (ENEM-2013) To build a subfloor, it is common to use cement, sand, and gravel in the following proportions: 1 part cement, 4 parts sand, and 2 parts gravel. To build the subfloor of a garage, a construction company ordered a concrete mixer truck with 14 m³ of concrete. What is the volume of cement, in m³, in the concrete load carried by the concrete mixer? a) 1.75 b) 2.00 c) 2.33 d) 4.00 e) 8.00 02. (ENEM-2017) A package of flour contains a cake recipe, part of which is reproduced below: Having only the measuring spoon indicated in the recipe, a housewife had to make some conversions to accurately measure the flour. Assume that the flour and yeast have equal densities. How many measuring spoons does each cup indicated in the recipe equal? a) 10. b) 20. c) 40. d) 80. e) 320. 03. (ENEM-2017) A factory has a fully automated section. Four identical machines work simultaneously and continuously for a 6-hour shift. After this period, the machines are shut down for 30 minutes for maintenance. If any machine requires further maintenance, it will be shut down until the next maintenance. One day, all four machines were required to produce a total of 9,000 items. Work began at 8:00 a.m. During a 6-hour shift, they produced 6,000 items, but during maintenance, it was discovered that one machine needed to be shut down. When the service was completed, the three machines that remained in operation underwent further maintenance, called depletion maintenance. At what time did depletion maintenance begin? a) 4:45 p.m. b) 6:30 p.m. c) 7:50 p.m. d) 9:15 p.m. e) 10:30 p.m. 04. (ENEM-2017) At 5:15 p.m., a heavy rain begins, falling with constant intensity. A rectangular parallelepiped-shaped pool, which was initially empty, begins to collect rainwater, and at 6:00 PM, the water level inside it reaches 20 cm. At that moment, the valve opens, releasing the water through a drain located at the bottom of the pool, which has a constant flow rate. At 6:40 PM, the rain stops, and at that exact moment, the water level in the pool has dropped to 15 cm. The time when the water in this pool completely drains is between a) 7:30 PM and 8:10 PM. b) 7:20 PM and 7:30 PM. c) 7:10 PM and 7:20 PM. d) 7:00 PM and 7:10 PM. e) 6:40 PM and 7:00 PM. 05. (ENEM-2016) A club has a soccer field with a total area of ​​8,000 m2, corresponding to the grass. Typically, the grass on this field is mowed by two of the club's dedicated lawn mowers. Working at the same pace, the two mowers together mow 200 m2 per hour. Due to the urgency of a soccer match, the field manager will need to request identical mowers from the neighboring club to complete the mowing service within a maximum of 5 hours. Using the two mowers the club already owns, what is the minimum number of mowers the field manager should request from the neighboring club? a) 4 b) 6 c) 8 d) 14 e) 16