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masha68 [24]
3 years ago
9

in a fireplace, about 3/4 of an 18-inch log will burn in 1/3 of an hour. How many hours will it take to burn 2 1/2 logs?

Mathematics
1 answer:
olga_2 [115]3 years ago
3 0
3/4 =1/3 hour
how long to burn 2 and 1/2

3/4=1/3hour
1/4=1/9 hour
4/4=1=4/9hour
1/2=2/4
1/2=2/9hour
 
2 and 1/2=1+1+1/2=4/9+4/9+2/9=10/9=9/9+1/9=1+1/9=1 and 1/9



answer is C. 1 and 1/9 hour
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A can do a piece of work in 4 hours and B can do it in 6 hours. How much time would they take working together to finish the wor
Kipish [7]

Answer:

2.4 hours

Step-by-step explanation:

Let total work = X

Rate of work done = X ÷ time

Rate of A = X/4

Rate of B = X/6

If they work together, rate is the sum of their individual rates, i.e.

X/4 + X/6

= (3X + 2X)/12 (taking LCM)

=5X/12

Rate = X/time

5X/12 = X/time

time = X÷(5X/12)

time = X × 12/(5X)

time = 2.4 hours

Shortcut:

Product of individual times/sum of individual times

= (4×6)/(4+6)

=24/10

=2.4 hours

8 0
3 years ago
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emmainna [20.7K]

Step-by-step explanation:

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Solve for y please help
ss7ja [257]

Answer:

The answer is (-16.6)

Step-by-step explanation:

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7 0
2 years ago
how can you tell before you divide 425 by 9 that the first digit of the quotient is in the tens place?
Goshia [24]
I don't understand that question
4 0
3 years ago
What is the factored form of 8x2 + 12x? 4(4x2 + 8x) 4x(2x + 3) 8x(x + 4) 8x(x2 + 4)
earnstyle [38]
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8 0
3 years ago
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