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3 years ago

The average of 7 numbers is 45.If the last two numbers are 27 and 43 what is the average of the first five

Mathematics

1 answer:

Paul [167]3 years ago

4 0

Answer:

Step-by-step explanation:

The average is calculated as

average = $\frac{sum}{count}$ Given the average of 7 numbers is 45 , then

$\frac{sum}{7}$ = 45 ( multiply both sides by 7 )

sum of 7 numbers = 315

Subtract 27, 43 from the sum to obtain the sum of first 5 numbers

315 - (27 + 43) = 315 - 70 = 245 , then

average of first 5 numbers = $\frac{245}{5}$ = 49

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2 years ago

Whats the value of x? 2−(3x−4)=2x−9

coldgirl [10]

Answer:

x=3

Step-by-step explanation:

Use pemdas!

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3 years ago

Need help with number 3<br><br><br> 8/t; t = 4

LUCKY_DIMON [66]

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2 years ago

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fredd [130]

Answer:

- The ratio of the height of the cone to the height of the cylinder is 3:1

- The ratio of the height of the cone to radius of the sphere is 4:1

Step-by-step explanation:

Note that the radii of all the structures are the same.

Let the height of the cone be H and the height of the cylinder be h

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1) The ratio of the height of the cone to the height of the cylinder

To obtain this, we equate the volume of those two structures

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(1/3)πr² cancels out on both sides and we're left with

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(H/r) = (4/1)

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3 years ago

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3 years ago