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Blizzard [7]
3 years ago
11

Average after 8 test is 91%. if he gets a 78% on his 9th test what will be the new acerage

Mathematics
1 answer:
Vika [28.1K]3 years ago
6 0
All you need to do is add te averages together then divide them by 2. 91%+78%=169% 169%÷2=84.5% So the new test average is 84.5%
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On a trip to Griffith Observatory, Dave rode his bicycle six more than twice as many miles in the afternoon as in the morning. I
podryga [215]

Answer:

Dave rode his bicycle 17 miles in the morning

Dave rode his bicycle 40 miles in the afternoon

Step-by-step explanation:

* Lets study the information to solve the question

- Dave rod his bicycle in the morning and again in the afternoon

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  means the distance in the afternoon is 6 more than twice the distance

  in the morning

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* To solve the question let the distance in the morning is x miles

∵ The distance in the morning = x miles

∵ The distance in the afternoon is 6 more than twice the distance

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∴ x + (2x + 6) = 57 ⇒ simplify

∴ 3x + 6 = 57 ⇒ subtract 6 from both sides

∴ 3x = 51 ⇒ divide both sides by 3

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∵ The distance in the morning is x miles

∴ Dave rode his bicycle 17 miles in the morning

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∴ The distance in the afternoon = 2(17) + 6 = 34 + 6 = 40 miles

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4 0
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94 POINTS!!! pls help
svp [43]

Answer:

Hey love! x = 6

Step-by-step explanation:

because 13 x 6 = 78

HOPE THIS HELPS!

7 0
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Step-by-step explanation:  

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Answer:

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