So... the radiator has 15 liters of 70% antifreeze.. but needs an 80% antifreeze
well, so, you need to drain some and put some with higher percentage, seems to be, you will end up at the same 15 liters, possible the radiator's capacity, of 80% antifreeze
so, the same amount going out, of 70% is the same amount going in, of 100% antifreeze
now.. let's use the decimal format for the percents, or 70% is 70/100 or 0.7 and so on
![\bf \begin{array}{lccclll} &amount&concentration& \begin{array}{llll} concentration\\ amount \end{array}\\ &-----&-------&-------\\ \textit{70\% sol'n, out}&x&0.7&0.7x\\ \textit{100\% sol'n, in}&x&1.00&x\\ \textit{current 70\% sol'n}&15&0.7&10.5\\ -----&-----&-------&-------\\ mixture&15&0.8&12 \end{array}](https://tex.z-dn.net/?f=%5Cbf%20%5Cbegin%7Barray%7D%7Blccclll%7D%0A%26amount%26concentration%26%0A%5Cbegin%7Barray%7D%7Bllll%7D%0Aconcentration%5C%5C%0Aamount%0A%5Cend%7Barray%7D%5C%5C%0A%26-----%26-------%26-------%5C%5C%0A%5Ctextit%7B70%5C%25%20sol%27n%2C%20out%7D%26x%260.7%260.7x%5C%5C%0A%5Ctextit%7B100%5C%25%20sol%27n%2C%20in%7D%26x%261.00%26x%5C%5C%0A%5Ctextit%7Bcurrent%2070%5C%25%20sol%27n%7D%2615%260.7%2610.5%5C%5C%0A-----%26-----%26-------%26-------%5C%5C%0Amixture%2615%260.8%2612%0A%5Cend%7Barray%7D)
so.. let's subtract, from the current solution, 0.7x and add 1x or x, our antifreeze concentration amount, should be 12 though
10.5 - 0.7x + x = 12
solve for "x"
I think u take the two numbers and times them
-72-54n+36=0
-72+36=54n
-36=54n
n=-36/54
Answer:
3p + 12
Step-by-step explanation:
5p -3p + 9 + p + 3
Move around the parts of the equation
5p -3p + p + 9 + 3
Add positive 9 to positive 3
5p -3p + p + 12
Add positive p to negative 3p
5p -2p + 12
Combine positive 5p and negative 2p together
3p + 12
I Hope That This Helps! :)
Step-by-step explanation:
34−1.9 + 1234-1.9 + 12
Find the common denominator.
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Write −1.9-1.9 as a fraction with denominator 11.
34 + −1.91 + 1234 + -1.91 + 12
Multiply −1.91-1.91 by 4444.
34 + −1.91⋅44 + 1234 + -1.91⋅44 + 12
Multiply −1.91-1.91 by 4444.
34 + −1.9⋅44 + 1234 + -1.9⋅44 + 12
Multiply 1212 by 2222.
34 + −1.9⋅44 + 12⋅2234 + -1.9⋅44 + 12⋅22
Multiply 1212 by 2222.
34 + −1.9⋅44 + 22⋅234 + -1.9⋅44 + 22⋅2
Multiply 22 by 22.
34 + −1.9⋅44 + 2434 + -1.9⋅44 + 24
Combine the fractions.
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Combine the fractions that have a common denominator.
3−1.9⋅4 + 243-1.9⋅4 + 24
Multiply −1.9-1.9 by 44.
3−7.6 + 243-7.6 + 24
Simplify the numerator.
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Subtract 7.67.6 from 33.
−4.6 + 24-4.6 + 24
Add −4.6 - 4.6 and 22.
−2.64-2.64
Divide −2.6-2.6 by 44.
−0.65-0.65