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mote1985 [20]
3 years ago
9

Ted needs an average of at least 70 on his three history tests. He has already scored 85 and 60 on two tests. What is the minimu

m grade Ted needs on his third test?
Mathematics
2 answers:
zaharov [31]3 years ago
7 0

Answer:

Minimum grade Ted needs on his third test is:

65

Step-by-step explanation:

Ted scored 85 and 60 on two tests.

Ted needs an average of at least 70 on his three history tests.

Let he scored x in third test

So,

\dfrac{85+60+x}{3}\geq  70

Multiplying both sides by 3, we get

85+60+x ≥ 70×3

145+x ≥ 210

subtracting both sides by 145, we get

x ≥ 65

Hence,  minimum grade Ted needs on his third test is:

65

taurus [48]3 years ago
6 0
To find the mean you must add up all the numbers and divide by how many there are:
35 + 60 + x
_________  =    70
        3

35 + 60 + x = 210

x = 65

He must score at least a 65 for a 70 average.
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