Diana invested some money in a bank at a fixed rate of interest compounded annually. The equation below shows the value of her i
1 answer:
You might be interested in
Answer:
The quantity of cement use is 125 pounds
The quantity of sand use is 375 pounds
The quantity of gravel use is 500 pounds
Step-by-step explanation:
Given as :
The ratio of cement to sand to gravel = 1 : 3 : 4
The total quantity of dry mix required = 1000 pounds
Let The quantity of cement required = 1 × x pounds
The quantity of sand required = 3 × x pounds
The quantity of gravel required = 4 × x pounds
So, According to question
The total quantity of dry mix required = The quantity of cement required + The quantity of sand required + The quantity of gravel required
Or, x + 3 x + 4 x = 1000 pounds
Or, 8 x = 1000 pounds
∴ x =
I.e x = 125
So , The quantity of cement required = 1 × 125 pounds = 125 pounds
The quantity of sand required = 3 × 125 pounds = 375 pounds
The quantity of gravel required = 4 × 125 pounds = 500 pounds
Hence The quantity of cement use is 125 pounds
The quantity of sand use is 375 pounds
The quantity of gravel use is 500 pounds
Answer
The considered decimal number is expressed by the fraction given by: Option C: 4/33
<h3>How to convert from decimal to fraction?</h3>For conversion from decimal to fraction, we write it in the form a/b such that the result of the fraction comes as the given decimal. Usually, to get the decimal of the form a.bcd, we count how many digits are there after the decimal point (if its finite), then we write 10 raised to that many power as denominator, and the considered number without any decimal point as numerator.
For example:
(10 raised to power k = 1 followed by k zeroes)
<h3>What is the sum of an infinite geometric series?</h3>The sum of an infinite geometric series having the initial term "a" and the multiplication per term is done by "r" such that r < 1
is given by
The series would look like
For the considered case, the given decimal number is
We can check all the options available one by one, so as to know which one ends up giving this pattern, or we can use another technique as shown below.
Each of the two series obtained are geometric series with the multiplication factor as 1/100
Using the sum formula for evaluation of an infinite geometric series, and the fact that initial term of first series is 0.1 and that of second series is 0.02, we get:
Thus, the considered decimal number is expressed by the fraction given by: Option C: 4/33
Learn more about geometric series here: