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Zigmanuir [339]
4 years ago
12

Machine A working alone can complete a job in 3 1/2 hours. Machine B working alone can do the same job in 4 2/3 hours. How long

will it take both machines working together at their respective constant rates to complete the job?A. 1 hr 10 minB. 2hrC. 4hr 5 minD. 7hrE. 8 hr 10 min
Mathematics
1 answer:
SIZIF [17.4K]4 years ago
5 0

Answer:

B) 2 hours

Step-by-step explanation:

If machine  A complete a job in 3 1/2 hours or 7/2 of an hour

means that in one hour finished 1÷ 7/2     or  2/7

If machine  B complete a job in 4 2/3 hours or  14/3 of an hour

means that in one hour finished 1÷ 14/3    or  3/14 of an hour

Then the two machines working together in one hour will make

2/7 + 3/14    =  (4 + 3)/ 14

or   7/14   = 1/2

half of the job. Therefore these two machines working together will take two hours

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What do I put for question a, b, c and d?
Marianna [84]

Answer:

Step-by-step explanation:

a) (52 + 63)/250 = 0,46 = 46%

b) (63+77)/250 = 0,56 = 56%

c) 63/140= 0.45 =  45%

d) vegetarian that exercise: 52/110 = 47%

Compararison with not vegetarian:

63 : 140 = x : 110

50/110

So the answer is the first option

8 0
3 years ago
Solve<br> (-4 + -7)(-3) <br> please!!!!!!!!!!!!!!!!!!!!!!!!!
miss Akunina [59]

So you add whats in parentheses first which gives you -11 then you end up with -11(-3)

Which will equal 33 Thats your final awnser...

33

6 0
2 years ago
Read 2 more answers
Please answer this question correctly for 24 points and brainliest!!
amm1812

Answer:

  $110

Step-by-step explanation:

Let a, b, and c represent the earnings of Alan, Bob, and Charles. The problem statement tells us ...

  a + b + c = 480 . . . . . . the combined total of their earnings

  -a + b = 40 . . . . . . . . . . Bob earned 40 more than Alan

  2a - c = 0 . . . . . . . . . . . Charles earned twice as much as Alan

Adding the first and third equations, we get ...

  (a + b + c) + (2a - c) = (480) + (0)

  3a + b = 480

Subtracting the second equation gives ...

  (3a +b) - (-a +b) = (480) -(40)

  4a = 440 . . . . . . . . simplify

  a = 110 . . . . . . . . . . divide by the coefficient of a

Alan earned $110.

_____

<em>Check</em>

Bob earned $40 more, so $150. Charles earned twice as much, so $220.

The total is then $110 +150 +220 = $480 . . . . as required

8 0
4 years ago
Find the slope of the line through each pair of points.
Elenna [48]

hello here is a solution



4 0
3 years ago
Solve forx: -6 &lt; x - 1 &lt; 9
Juli2301 [7.4K]

Answer:

-5< X <10

Step-by-step explanation:

-6+1 < x < 9+1

-5 < x < 10

4 0
4 years ago
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