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AfilCa [17]
4 years ago
10

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

k?
Mathematics
2 answers:
Kipish [7]4 years ago
8 0

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

Whitepunk [10]4 years ago
6 0

Answer:

5 hours

Step-by-step explanation:

A = 4hours

B= 6 hours

Average of A and B = (4hours+6hours)/2 = 5hours

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Maru [420]

Answer:

Area if rectangle= 55

Area of triangle=30

Total area=85

11x5=55

23-11=12

5/2=2.5

2.5x12=30

55+30=85

8 0
3 years ago
An F5 tornado is classified as having mean wind speeds greater than 261 mph. In an effort to classify a recent tornado, 20 wind
Anna35 [415]

Answer:

Type 2 error

Step-by-step explanation:

H0 : μ = 261

H0 : μ > 261

By failing to reject H0 ; when the it is false. This means accepting null hypothesis when it is actually FALSE. Then a type 2 error has been committed.

This is different from a type 1 error whereby the null hypothesis is rejected when it is actually TRUE.

Hence, by finding no evidence to reject the null hypothesis during statistical testing when the actual windspeed of an F5 tornado during statistical testing is actually greater than 261 mph.

6 0
3 years ago
Gregory sees an $80.00 jacket on sale at 30% off. How much will it cost after a 7% sales tax? $56.00 $59.92
ahrayia [7]
$80.00 × 30%
= $24
= $80 - $24
= $56 × 7%
= $3.92
= $56 + $3.92
= $59.92
7 0
4 years ago
Read 2 more answers
You buy a new yoga ball. The ball has a diameter of 26 inches. What is the volume of the ball? Use 3.14 for pi. Round your answe
Mazyrski [523]

Answer:

9,198.11 thats the answer i just did this and got it correct

hope it helped

Step-by-step explanation:


3 0
3 years ago
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A home improvement store buys snow shovels from a supplier for $8.50. The day before a snowstorm the store manager marks up the
balandron [24]

Answer:

The retail price is $15.30

Step-by-step explanation:

To solve this, turn the percentage into a decimal. Do this by dividing it by 100.

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Then, multiply the supplier price by the decimal

      8.5 × 1.8 = $15.30

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3 years ago
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