3 years ago

How many gallons of a 3% salt solution must be mixed with a 7% salt solution to obtain 100 gallons of a 5% salt solution.

Mathematics

1 answer:

MrRissso [65]3 years ago

6 0

Answer:

50 gallons of each.

Step-by-step explanation:

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Solve using the elimination method:<br> X-3y=7<br> 3x + 3y=9

sergij07 [2.7K]

Answer:

$x=4\\\\y=-1$

Step-by-step explanation:

Given Equation:

$x-3y=7$ Equation:1

$3x + 3y=9$ Equation:2

Dividing Equation:2 by '3' both the sides:

$x+y=3$

or $x=3-y$ Equation:3

Putting the vale of 'x' in Equation:1

$x-3y=7$

$(3-y)-3y=7\\\\3-y-3y=7\\\\3-4y=7\\\\$

Subtracting '3' both sides

$-4y=7-3\\\\-4y=4$

$y=\frac{4}{-4}$

$y=-1$

Putting value of 'y' in Equation:3

$x=3-y$

$x=3-(-1)\\\\x=3+1\\\\x=4$

The solution of the equations is :

$x=4\\\\y=-1$

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4 years ago

Explain how you can round 25.691 to the greatest place.

nadezda [96]

You have to round it to the nearest hundreds

4 0

3 years ago

King kyle orders the construction of his future mausoleum ( a fancy tomb) so that people never forget his awesomeness. His archi

BartSMP [9]

Answer:

okay so,

so do a 16 by 14 rectangle it should be good

sry if its wrong i tried but i hope it helped ;0

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3 years ago

Read 2 more answers

Use the order of operations to simplify the expression (2/7)^2 x (7/9)^2

Vlad [161]

(2/7)^2 x (7/9)^2
((2^2)/(7^2)) x ((7^2)/(9^2))
(4/49) x (49/81)
*Cross multiply*
(4/81)

4 0

3 years ago

Can someone please help me with this

Kryger [21]

Answer:

1. 96 inches squared

2. h=324

3. 85

Step-by-step explanation:

1. v=lwh

v=8•3•4

v=96

2. 345- 21

h=324

3. 1,012/12

=84.3

hope this helped!

7 0

3 years ago