1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Lilit [14]
3 years ago
10

Two grandparents want to pick up the mess that their granddaughter had made in her playroom. One can do it in 15 minutes working

alone. The​ other, working​ alone, can clean it in 12 minutes. How long will it take them if they work​ together?
Mathematics
1 answer:
Crank3 years ago
5 0

Answer:

  6 2/3 minutes

Step-by-step explanation:

Their rates in "jobs per hour" are ...

  (60 min/h)/(15 min/job) = 4 jobs/h

and

  (60 min/h)/(12 min/job) = 5 jobs/h

So, their combined rate is ...

  (4 jobs/h) + (5 jobs/h) = 9 jobs/h

The time required (in minutes) is ...

  (60 min/h)/(9 jobs/h) = (60/9) min = 6 2/3 min

Working together, it will take them 6 2/3 minutes.

You might be interested in
This is timed and Will mark BRAINLIEST!!!
sertanlavr [38]

answer is either A or D

I hope this help. but I'm not really sure.

5 0
3 years ago
Graph the solution set
antiseptic1488 [7]

Answer:

Graph by first drawing a horizontal line at 3 on the y axis. Anything below this line falls into the y is less than or equal to 3 range. Draw a vertical line at negative 2 on the x axis. This represents x > -2. The next one is a slanted line, so it'll be trickier to graph. If using a graph of 10 - 10, graph from (-8, -10) to (10, 8). If using a graph of 20 - 20, graph from (-18, -20) to (20, 18). As seen in the graph, anything to the upper left of this line is included.

The true inclusion is where all the ranges intersect. Be sure to color this the darkest or with a special pattern.

5 0
3 years ago
Find the lowest common denominator.<br> 1/3 and 5/7<br> The lowest common denominator is
vagabundo [1.1K]
The lowest common denominator is 21
7 0
3 years ago
What is 3,190,000 in scientific notaion?
dezoksy [38]
3,190,000 is  319 x 10^5 in scientific notation
7 0
3 years ago
Read 2 more answers
Please tell me answers ​
Anna11 [10]

Answer:

no 8 is 90° and no 9 is two

Step-by-step explanation:

90° and two circles can pass through a given point

8 0
3 years ago
Other questions:
  • 8 1/4 - 6 1/2, what is the answer and work for this?
    13·1 answer
  • 18 take away negative 10 is wha
    5·2 answers
  • A deli has five types of meat, two types of cheese,
    12·2 answers
  • Which equation represents a circle with a center at (-4,9) and a diameter of 10 units?
    13·1 answer
  • What's the additive identity of 9
    7·1 answer
  • Can someone please help me with this question it is a hard question for me to answer​
    8·1 answer
  • Does anyone know matrices?
    14·1 answer
  • 3(x+6)2=75 show steps
    7·1 answer
  • Please help me with this ASAP
    12·1 answer
  • Plz help will give brainliest
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!