QUESTÕES DE CONCURSO COM PORCENTAGEM #1 - Prof. Robson Liers - Mathematicamente

If this video helps you and you want the Mathematicamente com Prof. Robson Liers channel to continue growing, SUBSCRIBE, click "Like," and SHARE. This video is part of a series of videos featuring math exam questions covering a wide variety of topics. Today we have two questions from the CETREDE board involving percentages. One of the biggest challenges for students and public exam candidates when taking the exam is knowing how to interpret the math problem. 1) (CETREDE) I've already paid 20% of my debt to the bank. Today I'll pay another R$1,872.00, which corresponds to 30% of the remaining balance I owe. The total amount of my debt was: a) R$7,200.00 b) R$7,600.00 c) R$7,800.00 d) R$8,300.00 e) R$8,500.00 2) (CETREDE) A pair of sandals and a pair of shorts were sold for R$150.00 each. The sandals were sold at 25% below cost, and the shorts were sold at 25% above cost. For the store, the result of the sale was: a) A loss of R$20.00. b) Neither profit nor loss. c) A profit of R$40.00. d) A profit of R$20.00. e) A loss of R$40.00. WATCH ALSO: 5-SECOND ALGEBRA TRICK https://goo.gl/dy4PCY 3-SECOND POWER TRICK https://goo.gl/8RLnKT HOW TO INTERPRET PROBLEMS – PORTUGUESE IN MATHEMATICS https://goo.gl/FPUjYd 5-SECOND PERCENTAGE TRICK https://goo.gl/AETiub IMPROPER FRACTION TO MIXED NUMBER https://goo.gl/8AiQGL ADDITION AND SUBTRACTION OF FRACTIONS https://goo.gl/jevKHR FIRST-DEGREE EQUATION SYSTEM REPLACEMENT https://goo.gl/Npp6LF MATH TRICKS – FULL PLAYLIST https://goo.gl/5CuoGA MMC OR GCD? WHICH ONE TO USE? https://goo.gl/Thqabt Follow me on social media: FACEBOOK:   / robsonliers.professor   Instagram: @prof.robsonliers Twitter: @robson_liers Email: [email protected] Proposed Problem: A clothing store received a shipment of 350 shirts and 150 pairs of pants. Of the items received, 8% of the shirts were missing one of the buttons and 6% of the pants had zipper problems. The total number of defective items represents, in relation to the total number of items received, a percentage of (A) 10.6% (B) 9.3% (C) 8.2% (D) 7.4% (E) 6.5% Solution: First, we need to find the total number of defective items, that is, the number of defective shirts plus the number of defective pants. Let's see, 8% of 350 = 0.08. 350 = 28 shirts 6% of 150 = 0.06. 150 = 9 pairs of pants 28 + 9 = 37 defective items of clothing Since we have a total of 500 items (pants and shirts), we can use a rule of 3. 500 ----- 100% 37 ----- x Cross-multiplying (since it's a direct rule of 3), we get x = 7.4. Answer: D PERCENTAGE EXAM QUESTIONS #1 - Prof. Robson Liers - Mathematically