I need someone who is really good at questions like this! It is really important! Sorry for the quality!

Answer:
2 yellow pebbles
lol thats was fun.
basically a green pebble equals 3 red pebbles and 3 red pebbles equals 9 yellow pebbles (because a red pebble equals 3 yellow pebbles)
so keep in mind i simplified the one green pebble eventually equals to 9 yellow pebbles
now a blue pebble is equal to a red pebble and 2 yellow pebbles
we know a red pebble is 3 yellow pebbles so we add the 3 and 2 yellow pebbles to get 5 yellow pebbles
now because it says "a green pebble and a blue pebble divides" you add the 9 and 5 yellow pebbles to get 14 pebbles
then it says "divide by 2 red pebbles and a yellow pebble"
2 red pebbles equals 6 yellow pebbles
6 yellow pebbles plus one yellow pebble is 7 pebbles
now we got all we need...
14 yellow pebbles ÷ 7 yellow pebbles
EQUALS
2 yellow pebbles
HOPE THIS HELPS YE
The final value of the pebble and its color is 2 yellow pebbles.
Computation:
First, read the statement nicely, it is saying:
"Divide green pebble and a blue pebble by the sum of two red pebbles and a yellow pebble."
This will be done step by step taking into consideration each color pebble and its equivalent number of pebbles.
Lets take green pebble:
A green pebble is equal to three red pebble, that is:
[tex]1\;\text{green}=3\;\text{red}[/tex]
Now lets take red pebble:
A red pebble is equal to three yellow pebble, that is:
[tex]1\;\text{red}=3\;\text{yellow}[/tex]
This implies that three red pebble (of green) will be equal to:
[tex]3\;\text{red}=9\;\text{yellow}[/tex]
Now, lets take blue pebble:
A blue pebble is equal to one red and 2 yellow pebble, that is:
[tex]1\;\text{blue}=1\;\text{red}+2\;\text{yellow}[/tex]
Taking the equivalent values of red and blue pebbles the value will be:
[tex]1\;\text{blue}=3\;\text{yellow}+2\;\text{yellow}[/tex]
Now taking the given equation, that is:
The sum of 1 green pebble and 1 blue pebble is divided by 2 red pebble and 1 yellow pebble:
[tex]\begin{aligned}\text{Final Value of Pebble}&=\dfrac{\text{1 green+1 blue}}{\text{2 red+1 yellow}}\\&=\dfrac{\text{9 yellow+5 yellow}}{\text{6 yellow+1 yellow}}\\&=\dfrac{\text{14 yellow}}{\text{7 yellow}}\\&=2\;\text{yellow pebbles}\end{aligned}[/tex]
Thus, the final value of the pebble is 2 yellow colored pebble.
To know more about division, refer to the link:
https://brainly.com/question/369266