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ENEM 2021 – Solved mathematics: questions 136 to 150

Source: INEP – proof and template of the 2nd day, Notebook 5 – Yellow (1st application). The ENEM Mathematics and Technologies test 2021 was administered on the 2nd day and will from question 136 to 180. This post addresses questions 136 to 150. The numbering used here is that of the Notebook 5 – Yellow; us In other notebooks the same questions appear in a different order. Template Question Subject Template 136 Roman numeral system D 137 Addition in binary base D 138 Area and subdivision units C 139 Combinatorial analysis: combinations A 140 Cost per user (comparison) B 141 Percentage: heart rate D 142 Fewer number of washes (inequality) C 143 Discounts: lower expense C 144 Spatial geometry: faces of the structure A 145 Octahedron flattening E 146 Perimeter of equilateral triangle D 147 Volume of the cone frustum C 148 Areas of flat figures and cost E 149 Dimensional analysis B 150 Linear system: baggage mass B Question 136: Year of foundation in Roman numerals Statement The Roman numeral system is still used to indicate chapters and volumes of books, in the designation of centuries and, in chronological order, of popes and kings of the same name. Seven letters of the alphabet are used:

September 26, 2026 Read
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ENEM 2021 – Solved mathematics: questions 151 to 165

Source: INEP – proof and template of the 2nd day, Notebook 5 – Yellow (1st application). The ENEM Mathematics and Technologies test 2021 was administered on the 2nd day and will from question 136 to 180. This post addresses questions 151 to 165. The numbering used here is that of the Notebook 5 – Yellow; us In other notebooks the same questions appear in a different order. Template Question Subject Template 151 Fuel performance (km/L) D 152 Areas of a parallelepiped B 153 Cylinder volume D 154 Graph of piecewise defined function A 155 Quadratic function with integer domain E 156 Matrices: reading the elements E 157 Successive percentage changes B 158 Inversely proportional quantities A 159 Optimization: lower cost D 160 Percentage: quantity reduction C 161 Trigonometric function: spring movement A 162 Definite operations and 2nd degree equation E 163 Scale C 164 Projection and ratio per thousand inhabitants D 165 Chart Reading: Monthly Profit B Question 151: Performance of the new engine Statement A car has an average performance of 16 km/L. An engineer developed a new combustion engine that saves, in relation to fuel consumption, previous engine, 0,1 L of fuel for every 20 km travelled.

September 26, 2026 Read
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ENEM 2021 – Solved mathematics: questions 166 to 180

Source: INEP – proof and template of the 2nd day, Notebook 5 – Yellow (1st application). The ENEM Mathematics and Technologies test 2021 was administered on the 2nd day and will from question 136 to 180. This post addresses questions 166 to 180. The numbering used here is that of the Notebook 5 – Yellow; us In other notebooks the same questions appear in a different order. Template Question Subject Template 166 Percentage increase C 167 Histogram and accumulated frequency C 168 Caesar cipher and letter frequency C 169 Statistics: median C 170 Percentage: reservoir volume D 171 Weighted average D 172 Weighted average and linear system C 173 Coefficient of variation E 174 Comparison of means E 175 Weighted average: monthly revenue B 176 Algebraic expression with percentage A 177 Probability of the complementary event B 178 Combinatorial analysis (cancelled) Canceled 179 Powers of the golden ratio E 180 Orthogonal projection of the cube E Question 166: Increase in sales of antidepressants Statement Depression is characterized by an imbalance in brain chemistry. The Neurons in a depressed person do not respond well to stimuli from neurotransmitters. Medicines that combat depression aim to restore brain chemistry. With the gradual increase in cases of depression, the sale of these medicines is increasingly evolving, as illustrated by the graphic.

September 26, 2026 Read