Question

Gil earns three scores on tests 86, 88 and 78. What's the lowest score Gil can earn on the fourth test if he wants an average of 83

Answer 1

To find the lowest score Gil can earn on the fourth test to achieve an average of 83, we can use the formula for average and solve for the unknown score.

Step-by-step explanation:

To find the lowest score Gil can earn on the fourth test to have an average of 83, we can use the formula:

Average = (Total score)/(Number of tests)

Given that Gil has already taken three tests with scores of 86, 88, and 78, we can set up the equation:

83 = (86 + 88 + 78 + x)/4

Where 'x' represents the score on the fourth test. Solving for 'x', we get:

x = 83*4 - 86 - 88 - 78 = 332 - 86 - 88 - 78 = 332 - 252 = 80

So, the lowest score Gil can earn on the fourth test to achieve an average of 83 is 80.