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3 years ago

The mean of 5 numbers is 12. If four of the numbers are 1, 2, 3, 20, what is the last number?

Mathematics

2 answers:

Sergeu [11.5K]3 years ago

8 0

The last number is 34 because. 1+2+3+20+34= 60 and 60 divided by 5 is 12

liubo4ka [24]3 years ago

7 0

So the last number is 34.

Hope this will help u...

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Given: rectangle ABCD is similar to rectangle ZBXY. If ZY = 5, XC = 3, DC = 4, then XY =

soldier1979 [14.2K]

Answer:

The length of XY is either 10 or 2.5.

Step-by-step explanation:

Given information: ZY = 5, XC = 3 and DC = 4.

Case 1: Rectangle ABCD is smaller than ZBXY.

The opposite sides of the rectangle are same.

$ZY=BC+XC$

$5=BC+3$

$2=BC$

The length of ABCD is 4 and width of ABCD is 2. The width of ZBXY is 5. The corresponding sides of the similar rectangles are is in the same proportion.

$\frac{4}{XY}=\frac{2}{5}$

$\frac{4\times 5}{2}=XY$

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Therefore the value of XY is 10.

Case 2: Rectangle ABCD is larger than ZBXY.

$ZY=BC-XC$

$5=BC-3$

$8=BC$

The length of ABCD is 4 and width of ABCD is 8. The width of ZBXY is 5. The corresponding sides of the similar rectangles are is in the same proportion.

$\frac{4}{XY}=\frac{8}{5}$

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$2.5=XY$

Therefore the value of XY is 2.5.

7 0

3 years ago

Read 2 more answers