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inna [77]
3 years ago
7

Alexis recieved an 85,89,92on three tests.How many points does she need to score on her next test in order to have an average of

at least 90?
Mathematics
2 answers:
Vladimir [108]3 years ago
5 0
94

(85+89+92+x)/4 = 90

(266+x)/4 = 90
(Multiply by 4 on each side to get rid of it)

266+x=360
(subtract 266 from each side)

x = 94


saveliy_v [14]3 years ago
5 0

Answer:

94

Step-by-step explanation:

Given: Alexis recieved an 85,89,92on three tests

To Find: Number of points she needs to score in order to have an average of atleast 90.

Solution:

Let the marks scored by Alexis in next test = \text{x}

Marks scored by Alexis in three test = 85

                                                               89

                                                               92

Sum of marks scored by Alexis = 85+89+92

                                                    =266        

Average of Alexis's marks after next test = \frac{\text{Sum of marks of all tests}}{4}

                                                                  =\frac{266+\text{x}}{4}

To have average of at least 90

                                               \frac{266+\text{x}}{4}≥90

                                               266+\text{x}\geq 360

                                               \text{x}\geq 94

Alexis needs to score atleast 94 to have an average of at least 90

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