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g100num [7]
4 years ago
11

An electrician can wire a house in 20 hours. if she works with an apprentice, the same job can be completed in 12 hours. how lon

g would it take the apprentice, working alone, to wire the house?
Mathematics
1 answer:
AlekseyPX4 years ago
4 0
We know that
<span>An electrician can wire a house in ------------> 20 hours
so
100%----------------> 20 hours
 X-------------------> 12 hour
x=12*100/20----> x=60%

that means 
</span><span>the apprentice in 12 hours complete the (100-60)----> 40%

</span>the apprentice in 12 hours complete -------> 40%
x hours------------------------------------> 100%
x=100*12/40-----> x=30 hours

the answer is
30 hours


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a local hamburger shop sold a combined total of 808 hamburgers and cheese burgers on Saturday.there were 58 more cheese burgers
d1i1m1o1n [39]
C+H=808

C=H+58

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H+58+H=808

2H+58=808

2H=808-58

2H=750

H=750/2=375.

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C+375=808

C=808-375=433

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So, 433 cheeseburgers were sold and 375 hamburgers were sold.
7 0
3 years ago
A refrigerator cost 295 more than an oven costs. The oven cost 325 how much does the refrigerator cost
FinnZ [79.3K]

Answer:620

Step-by-step explanation:

325+295=620

7 0
3 years ago
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The expression represents the cost of Janelle’s cell phone bill, where m represents the number of minutes of use. 0.05m + 12 Wha
inn [45]

Answer:

The constant in the expression is 12

Step-by-step explanation:

The constant of the expression is the value that is independent of the number of minutes Janelle uses. The expression can  be written as :

f(m)=0.05m +12

Example if m is 1 or 2

f(1) = 0.05(1) +12 = 12.05

f(2= = 0.05*2 +12 =0.1 +12 = 12.1

The value 12 is the minimum price of the bill indepent of the consumption of minutes of Janelle. She will always be charged this value.

8 0
3 years ago
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There are $5$ girls and $5$ boys in a chess club. The club holds a round-robin tournament in which every player plays against ev
Nadusha1986 [10]
To get the total number of games possible, we will use the combination formula. 
Total number of games :  _{10}C_{2} = 45

Total of 45 games in the whole tournament.

Meanwhile, if there would be boy-versus-boy, we will have _{5}C_{2}
The answer is 10. 

The fraction for boy-versus-boy game will be 10/45 or 2/9 when simplified.
6 0
3 years ago
The lenght of a turtles shell z, in millimeters, is related to the turtles age in years a , as described by the equation below.
puteri [66]

Answer:

B, C , F

Step-by-step explanation:

The age multiplied 55, so the shell grows at rate of 55mm per year

in fact if the age is 2 we have (55 x 2) = 55 + 55

if 3 = (55 x 3) = 55 + 55 + 55

and so on

When the turtle is hatched the shell is 37 mm in lenght.

In fact, if we substitute 0 to a, we have

s = (55 x 0) + 37

s = 37

when the turtle is 1 year old, the shell is 92 mm in length.

in fact if we substitu a with 1, we have

s = (55 x 1) + 37

s = 55 + 37

s = 92

8 0
3 years ago
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