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polet [3.4K]
3 years ago
7

Number of graduates: suppose 75% of the graduating class in a certain high school goes on to college. if 270 students from this

graduation class are going on to college, how many students are from this graduating class?
Mathematics
1 answer:
professor190 [17]3 years ago
6 0
270 x 0.75 = 202.5 students, so say 203 students
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Solve for x.<br> 9(x - 2) = 18<br> o x=0<br> X = 16/9<br> x = 20/9
iragen [17]

Answer:

x = 4

Step-by-step explanation:

9(x - 2) = 18

9x - 18 = 18

9x = 18 + 18

9x = 36

x = 36/9

x = 4

5 0
3 years ago
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A chemist has 20% and 50% solutions of acid available. How many liters of each solution should be mixed to obtain 75 liters of 2
mash [69]

Answer:

we will mix 55 liters of 20% solution and 20 Liters of 50% solutions.

Step-by-step explanation:

let the 20% solution = x liters

let the 50% solution = y liters

total solution of the mixture of the two solutions in % = 28%

total solution of the mixture of the two solutions in liters = 75 liters

considering the total solutions given, we will have the following equations if we mix the solutions in equal proportion;

20x + 50y = 28 (75)

0.2x + 0.5y = 0.28(75)

0.2x + 0.5y = 21 -------equation 1

Also,

x + y = 75 ------equation 2

y = 75 - x  

(substitute this into equation 1)

0.2x + 0.5(75 - x) = 21

0.2x + 37.5 - 0.5x = 21

0.2x - 0.5x = 21 - 37.5

-0.3x = -16.5

x = -16.5 / -0.3

x = 55 liters

Recall, y = 75 - x

y = 75 -55

y = 20 Liters

Thus, we will mix 55 liters of 20% solution and 20 Liters of 50% solutions.

5 0
3 years ago
Luke was playing checkers with a friend. The ratio of games Luke won was 9:8 if Luke won 18 games, how many games did his friend
Yakvenalex [24]
You basically simplify for this one,18 / ? = 9

18/2=9

So in this case, 8*2 is 16! Hope this helps!
4 0
3 years ago
1. Simplify: 4.6x^2+3.2x-4x+2.7x^2-x
IgorC [24]
2. 6a+7 thats the answer for two
3 0
4 years ago
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