Answer:
Your answer is that she needs to earn $148 on Friday
Explanation:
Calculate Average:
(67 + 82 + 78) / 4 = 56.75 (Remember 67 is worth Monday and Tuesday)
We know that the number that the 4 numbers add up to has to be divisible by 5 because our we need to average 75 and we have 5 days to average on.
5 x 75 = 375
67 + 82 + 78 = 227
375 - 227 = 148
(67+82+78+148) / 5 = 75
Your answer is that she needs to earn $148 on Friday
