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
Answer: uh do I subtract add multiply or divide?
Step-by-step explanation:
6 spiral notebooks for $13.50.
1 spiral notebook costs?
13.50 ÷ 6 = 2.25
1 spiral notebook costs $2.25.
Check:-
2.25 × 6 = 13.50
Correct!
$2.25 per spiral notebook
The side opposite from the shortest side, always, is called the <u><em>Hypotenuse</em></u>.
Answer:
66%
Step-by-step explanation:
Let u represent the <em>number</em> from the USA. Then the number from Singapore is u-120. The given relationship is the fraction of participants from Singapore:
(u -120) = 0.26(u +(u -120) +24)
u -120 = 0.52u -24.96
0.48u = 95.04
u = 198 . . . . . . . . divide by the coefficient of u; participants from the USA
Then the <em>fraction</em> from the USA is ...
u/(2u-96) = 198/300 = 66% . . . percentage from the USA
_____
<em>Additional comment</em>
198 (66%) were from the USA
78 (26%) were from Singapore
24 (8%) were from Japan