Pretty much all you are doing is completing the problem with the help of a model so first, you are going to multiply 800*8 which equals 6400 then since you already have the existing number 560 so 6400-560=5840 then to fill in the values you do what times 8 equals 5840 since it is not completely possible you put whatever is left in the remainder box.
I'm not absolutely sure this is correct but this is how we did it when I was in elementary school.
ps. You can check if you have the right final answer afterward online or with a calculator
Answer:
Step-by-step explanation:
I don't know how to explain this but here you go.
Hello,
add the -7.9 and the -3.4
-11.3+8.2+2.1
add the two positives
-11.3+10.3
calculate the sum
-1
We can use these variables:
A = number of ounces for solution A
B = Number of ounces for solution B
A + B = 20
Now, we can use decimal conversions.
0.65A + 0.80B = 0.70(120)
Next step: We substitute A into 120 - B to show their relationship.
0.65(120 - B) + 0.80B = 84
Now onto the next equation:
78 - 0.65B + 0.80B = 84
0.80 - 0.65 = 0.15, so…
0.15B = 84 - 78
0.15B = 6
B = 6 divided by 0.15
B = 40 ounces
To find A, we can simply plug B into the starting equation.
A = 120 - 40
A = 60 ounces
Your final answer: The scientist should use 60 ounces of solution A and she should use 40 ounces of solution B. Yeah
11:100
iwan:siobhan
if iwan gets 11% then iwan gets 89/100