Ask question

Ask question

All categories

4 years ago

11

If there are 400 cubic centimeters of a chemical in 1 liter of solution, how many cubic centimeters of water must be added to di

lute it to a 25% solution?

1 answer:

mars1129 [50]4 years ago

5 0

$1l=1dm^3\\1dm=10cm\to1dm^3=(10cm)^3=1000cm^3\\\\1l=1000cm^3\\-------------\\ \begin{array}{ccc}400cm^3&-&25\%\\1000cm^3+x&-&100\%\end{array}\\cross\ multiply\\25(1000+x)=400\times100\\25000+25x=40000\ \ \ \ \ |subtract\ 25000\ from\ both\ sides\\25x=15000\ \ \ \ |divide\ both\ sides\ by\ 25\\\boxed{x=600\ (cm^3)}\\\\Answer:Must\ be\ added\ 600cm^3\ of\ water.$

You might be interested in

The diameter of a circle is 6.4 in.

DedPeter [7]

Answer:

B. 32.154 in²

Step-by-step explanation:

A= 3.14 * r^2

A= 3.14 * 3.2^2

A= 32.154

3 0

2 years ago

Read 2 more answers

The line segment is reflected about the x axis to form e'f . which statement describes e'f

Colt1911 [192]

What grade are you in and i can tell you what the asnswer is

4 0

3 years ago

Make x the subject of the formula for Q20.

saul85 [17]

Answer:

$x = \sqrt{m(\frac{a}{b})^{2} +n }$

Step-by-step explanation:

$a\sqrt{(\frac{x^{2} - n }{m}) } = \frac{a^{2} }{b}$

$\sqrt{\frac{x^{2} - n }{m} } = \frac{a}{b}$ [Divide both sides by $a$ ]

$\frac{x^{2} - n}{m} = (\frac{a}{b} )^{2}$ [Square both sides]

$x^{2} -n = m(\frac{a}{b} )^{2}$ [Multiply both sides by m]

$x^{2} =m(\frac{a}{b} )^{2} + n$ [Bring n to the right]

$x = \sqrt{m(\frac{a}{b})^{2} +n }$ [Square root both sides]

7 0

3 years ago

Brandon makes 4/5 of his free throw shots when he play. If he takes 45 shots how many is he expected to make

LUCKY_DIMON [66]

4/5 = 80%

80% of 45 is

.8 x 45 = 36

He is expected to make 36 of his shots

5 0

3 years ago

SOMEONE PLSSSS HELP ME WITH THIS QUESTION!!!

Doss [256]

Answer:

12% males do not commute to work daily

3 0

3 years ago