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emmasim [6.3K]
2 years ago
13

P P,Q and R can finish a task in 8, 10 and 12 hours respectivly.They started working together but after 3 hours, P and R left. H

ow long will Q take to finish the task now?​
Detail it
Mathematics
1 answer:
zimovet [89]2 years ago
7 0

Answer:

45 minutes

Step-by-step explanation:

Assume task completed in total x hours

\frac{x}{10} + \frac{3}{8} + \frac{3}{12} = 1 \\ 12x + 45 + 30 = 120 \\ 12x = 45 \\ x = \frac{15}{4} = 3 \frac{3}{4}

So q will take 45 more minutes

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Select all that apply. Which of the following are proportions? 25/10=5/2,3/4=8/10,2/8=3/12,3/4=15/20
8_murik_8 [283]

Answer:

\frac{25}{10} = \frac{5}{2} is in proportion.

\frac{3}{4} = \frac{8}{10} is not in proportion.

\frac{2}{8} = \frac{3}{12} is in proportion.

\frac{3}{4} = \frac{15}{20} is in proportion.

Step-by-step explanation:

The first example is \frac{25}{10} = \frac{5}{2} and it is in proportion.

This is because, you will get the same simplest fraction (\frac{5}{2}) from the fraction \frac{25}{10} by dividing its numerator and denominator by 5.

The second example is \frac{3}{4} = \frac{8}{10} and it is not in proportion.

This is because, you can not  get the simplest fraction (\frac{3}{4}) from the fraction \frac{8}{10} after simplification.

The third example is \frac{2}{8} = \frac{3}{12} and it is in proportion.

This is because, you will get the same simplest fraction (\frac{1}{4}) from the fraction \frac{2}{8} by dividing its numerator and denominator by 2 and from the fraction \frac{3}{12} by dividing its numerator and denominator by 3.

The fourth example is \frac{3}{4} = \frac{15}{20} and it is in proportion.

This is because, you will get the same simplest fraction (\frac{3}{4}) from the fraction \frac{15}{20} by dividing its numerator and denominator by 5. (Answer)

3 0
3 years ago
Read 2 more answers
What is the mean, medium, mode of 54,220
irina [24]

Answer:

Mean: 16.75

Median: 15.5

Mode: 13

Range: 16

Minimum: 9

Maximum: 25

Count n: 16

Sum: 268

Step-by-step explanation:

hope this helps!

7 0
2 years ago
Jessie competes in hot dog eating contests he can eat 32 hot dogs in 8 minutes.How many hot dogs can he eat in 12 mins?
Olenka [21]
The answer is: he can eat 48 hotdogs in 12 minutes. How? Well, first, to find the amount of hotdogs he can eat in 1 min. you have to divide 32 by 8, and obviously you get 4. Now you multiply 4 by 12 and you get your answer, which is 48. Good luck with your homework! 
4 0
3 years ago
Read 2 more answers
I’ve been stuck on this for a min now
dedylja [7]

Answer:

3/14

Step-by-step explanation:

1st subtract the y's

the subtract the x's in the same order

-9 - 5 = -14

put the first result over the second

-3/-14 = 3/14

4 0
2 years ago
Please HELP!!<br> Which linear inequality is represented by the graph
garri49 [273]

Answer:

The answer should be y ≤ 1/3x - 1 I believe

8 0
3 years ago
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