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matrenka [14]
3 years ago
11

How many liters of a 20% alcohol solution must be mixed with 60 liters of a 90% solution to get a 30% solution?

Mathematics
1 answer:
Alex17521 [72]3 years ago
7 0
You would need to add 360L of the 20% ethanol solution. 
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It takes 32 hours for a motorboat moving downriver to get from pier A to pier B. The return journey takes 48 hours. How long doe
lina2011 [118]

Answer:

Time taken by the un powered raft to cover this distance is T = 192.12 hr

Step-by-step explanation:

Let speed of boat = u \frac{km}{hr}

Speed of current = v \frac{km}{hr}

Let distance between A & B = 100 km

Time taken in downstream = 32 hours

32 = \frac{100}{u +v}

u + v = \frac{100}{32}

u + v = 3.125 ------ (1)

Time taken in upstream = 48 hours

48 = \frac{100}{u -v}

u -v = \frac{100}{48}

u - v = 2.084 ------- (2)

By solving equation (1) & (2)

u = 2.6045 \frac{km}{hr}

v = 0.5205 \frac{km}{hr}

Now the time taken by the un powered raft to cover this distance

T = \frac{100}{v}

Because un powered raft travel with the speed of the current.

T = \frac{100}{0.5205}

T = 192.12 hr

Therefore the  time taken by the un powered raft to cover this distance is

T = 192.12 hr

3 0
3 years ago
Read 2 more answers
•Use the Pythagorean Theorem c^6 = a2+ b2 •Show you work to find each missing side •
zhannawk [14.2K]

Answer:

hypotenuse = 10

Step-by-step explanation:

If you can tell at first glance it is a 3,4,5 triangle (6,8,10)/2=(3,4,5). Then you know that c has to equal 5.

If not,

a^2+b^2=c^2

6^2+8^2=c^2

36+64=c^2

100=c^2

10=c

6 0
3 years ago
Grace and her father spent 4 1/2 hours over the weekend restoring their fishing boat. This time makes up 6% of the
solong [7]
\frac{9}{2} multiplied by \frac{6}{100}
= 75 hours
4 and a half hour repairs 6% of the entire boat so it is 
4 1/2 multiplied by 6/100's inverse number

6 0
3 years ago
Read 2 more answers
Write 4 216 in expanded form
joja [24]

Answer:

4000+200+10+6

Step-by-step explanation:

Have a good day and stay safe!

5 0
3 years ago
Read 2 more answers
What is this number in standard form? (5×1,000)+(9×1)+(2×1/10)+(6×1/1,000)
mr Goodwill [35]

Answer:

5009.206

Step-by-step explanation:

<u>The answer is </u><em><u>5009.206</u></em>. We see that the first portion of this question asks, "(5×1,000)+(9×1)". 5x1000 is 5000. 9x1 is 9. 5000+9= 5009. The second portion of this question asks for the numbers that go after the decimal. 2x1/10 is 2/10. 6x1/1000 is 6/1000. The decimal place stands for one. So we do .206. If the decimal stands for ones that means in this case the 2 is in the tenths place (like it should be since the question asks for 2/10) and the 6 is in the 1000 place (like it should be since the question asks for 6/1000). We add this up together and our answer is 5009.206. Hope this explanation helps! Happy learning!

5 0
3 years ago
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