Question 3
Fourth-grade students took a mathematics test containing 20 problems. For each correctly solved problem 5 points are earned, and for each incorrectly solved or unsolved problem 3 points are lost.
a) How many problems did Ivan solve, if he earned 76 points?
b) What is the maximum number of problems a student may get wrong if he wants to be sure of getting a grade of 5? The minimum number of points needed for grade 5 is the solution of the equation $8245:x=97$.
a) How many problems did Ivan solve, if he earned 76 points?
b) What is the maximum number of problems a student may get wrong if he wants to be sure of getting a grade of 5? The minimum number of points needed for grade 5 is the solution of the equation $8245:x=97$.