To succeed in a competition, Jermilin requires an average score of 75 in four exams. His score in the first three exams is 78, 74 and 70. How many scores should he get in the fourth test to succeed in the competition?

Step-by-step solution

Given: Jermilin's scores in the first three exams: 78, 74, 70 The average score required in all four exams: 75 Let x be the score Jermilin needs to get in the fourth exam to achieve an average score of 75. Formula: Average score (= ) (sum of all scores) (/ ) (number of scores) Calculation: We can use this formula to solve for x : (75=(78+74+70+x) / 4 ) Multiplying both sides by 4 : (300=222+x ) Subtracting 222 from both sides: (x=78 ) Therefore, Jermilin needs to score 78 in the fourth exam to achieve an average sc