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LUCKY_DIMON [66]
4 years ago
8

Jake makes concrete by mixing cemente, sand and gravel in the ratio 4:2:1 work out the mass of the sand in 38.5kg of concrete mi

x
Mathematics
2 answers:
Dmitry_Shevchenko [17]4 years ago
8 0
You divide 38.5 by 7 then times your answer by 2
The answer is 1.4285kg
liubo4ka [24]4 years ago
6 0

Answer:

11kg

Step-by-step explanation:

In order to answer this question you need to find out how much cement, sand and gravel is needed to make 38.5g of concrete mix. To do this you must find out how many parts the concrete mix ratio is made up (4 + 2 + 1 = 7) Then divide the total concrete mix (38.5kg) by the number of parts; 38.5/7 = 5.5. This tells you that each of the 7 parts of the ratio = 5.5kg. As the ratio tells you sand is 2 parts you multiply this by 5.5 (2 x 5.5kg = 11kg).

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Smith engineering is in the process of reviewing the salaries of their surveyors. During this review the company found that expe
crimeas [40]

Answer:

1 hour and 42.85 minutes.

Step-by-step explanation:

It is found from the process of reviewing that experience survey a roadbed in 3 hours.

Hence, in 1 hour the experience survey \frac{1}{3} of the roadbed.

Again, it is found that the apprentice survey needs 4 hours to survey the same stretch of road.

So, in 1 hour the apprentice survey does \frac{1}{4} of the roadbed survey.

If they work together then in 1 hour, the survey work will be done by (\frac{1}{3} +\frac{1}{4})= \frac{7}{12} parts.

Therefore, the total survey they will complete working together in \frac{12}{7} hours i.e. 1 hour and 42.85 minutes. (Answer)

3 0
3 years ago
A paper has an area of 72 square inches. what is the paper's area in square centimeters? use the following conversion: 1 square
krek1111 [17]
72*6.5=468 cm
Hope this helps
7 0
4 years ago
Need help ASAP pic included w/ answer options
alexandr402 [8]

Answer: |x − 39,800| < 1,300

The range of salaries is from $38,500 to $41,100.

Step-by-step explanation: i took the test

5 0
3 years ago
The domain is an interval. The domain is the function is (answer.)
Dmitriy789 [7]

Answer:

Domain :Set of all real values

Range : -5

Step-by-step explanation:

Here we see the blue line. Assuming it to be the graph of the function we are about to find Domain for.

Here we see that the graph is a straight line , parallel to x axis at y=-5

Hence the function will be

f(x)=-5

Also for every values of x, y =-5. Hence it is defined for all values of x. So the Domain is Set of All Real numbers

However,

For every value of x, the value of y is constant that is -5. Hence The range of f(x)=-5 is {-5}

8 0
3 years ago
Read 2 more answers
Easy middle school math help pls?
Trava [24]
You're correct with the answer you have selected. It's 7.2 x 10^7
4 0
3 years ago
Read 2 more answers
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