Answer:
The number of letters in the one street be 220 .
Step-by-step explanation:
As given
A postman has to deliver 450 letters .
The number of letters delivered in one street is twice the number delivered in other .
Let us assume that the number of letters delivered in second street be x.
Let us assume that the number of letters delivered in first street = 2x
As given
If he is left with 120 letters .
Thus
The number of letter delivered in one and other street = 450 - 120
= 330
Than the equation becomes
x + 2x = 330
3x = 330
x = 110
The number of letters in the one street = 2 × 110
= 220
Therefore the number of letters delivered in first street be 220.
Answer:
5.25
Step-by-step explanation:
So lets gather our information(Note that I use x as the small x value and X as the larger and missing value)
First off, we know that x is 3.
We know that the X value is a scale of x by 1.75.
We can think of this as 1.75x.
So to find X, we can multiply x by the scale 1.75:
x*1.75=X
plug in the value we know for x:
3*1.75=X
=
<u>5.25=X</u>
<u>So our answer is 5.25!</u>
Hope this helps! :)
Answer:
0.5
because it is a standard deviation