Ask question

Ask question

All categories

3 years ago

12

Maya added 5 grams of salt into 20 grams of 50% salt solution. She made _ grams of _% salt solution.

1 answer:

AlladinOne [14]3 years ago

7 0

Consider the suggested option:
1) if in 20 gr. of 50% solution given, then pure salt in this mix is 0.5*20=10 gr., and pure water is 0.5*20=10 gr.
2) after Maya added 5 gr. pure salt is 10+5=15 gr. Total mass of mix is 15(pure salt)+10(pure water)=25 gr.
3) new solution is 15/25=0.6 or 60%.
Answer: 25 gr. of 60% salt solution.

You might be interested in

A researcher has two percentages and wants to know if the percentages are statistically different. The researcher calculates the

love history [14]

Answer:

$p_v =2*P(Z>4.21) =2.55x10^{-5}$

And we can use the following excel code to find it:"=2*(1-NORM.DIST(4.21,0,1,TRUE)) "

With the p value obtained and using the significance level assumed for example $\alpha=0.05$ we have $p_v$ so we can conclude that we have enough evidence to reject the null hypothesis, and we can said that at 5% of significance the percentage 1 is significantly different from the percentage 2.

D) Are statistically different.

Step-by-step explanation:

The system of hypothesis on this case are:

Null hypothesis: $\mu_1 = \mu_2$

Alternative hypothesis: $\mu_1 \neq \mu_2$

Or equivalently:

Null hypothesis: $\mu_1 - \mu_2 = 0$

Alternative hypothesis: $\mu_1 -\mu_2\neq 0$

Where $\mu_1$ and $\mu_2$ represent the percentages that we want to test on this case.

The statistic calculated is on this case was Z=4.21. Since we are conducting a two tailed test the p value can be founded on this way.

$p_v =2*P(Z>4.21) =2.55x10^{-5}$

And we can use the following excel code to find it:"=2*(1-NORM.DIST(4.21,0,1,TRUE)) "

With the p value obtained and using the significance level assumed for example $\alpha=0.05$ we have $p_v$ so we can conclude that we have enough evidence to reject the null hypothesis, and we can said that at 5% of significance the percentage 1 is significantly different from the percentage 2.

And the best option on this case would be:

D) Are statistically different.

4 0

3 years ago

The diameter of a wheel is 98 cm. How many times would the wheel rotate to cover is 7.7 km?

olga nikolaevna [1]

For the first problem it would take about 2500 revolutions to gover such a distance and in 500 revolutions, it will travel 1539.4 meters.

4 0

3 years ago

Lena is recording the number of points she misses on each math quiz. Here are her results for the last nine quizzes.

sp2606 [1]

Answer:

The range of the data is the difference between the largest and smallest value. In this case, the largest value is 8 and the smallest value is 1.

Hence, the range is $8-7=1$ .

---------------------------------------------

The mode is the value that appears in a data set the most. When you arrange them in ascending order:

$1, 4, 6, 6, 6, 6, 6, 8, 8$

You can count that the value "6" appears five times, which is the most in this set.

Hence, the mode is 6.

4 0

2 years ago

Read 2 more answers

help !! will give brainliest and thanks You make skateboard ramps by cutting pieces from a board that is 12 1/2 long. How many r

Simora [160]

Answer:

5.5 hope that helps

Step-by-step explanation:

5 0

3 years ago

Hows the weather today..?<br>

Talja [164]

Answer:

good

Step-by-step explanation:

5 0

3 years ago