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Komok [63]
3 years ago
5

What is the value of y in the equation 5x + 2y = 20, when x = 0.3?

Mathematics
2 answers:
ycow [4]3 years ago
8 0

Answer:

9.25

Step-by-step explanation:

kiruha [24]3 years ago
5 0
Sub x= 0.3
5(0.3) + 2y = 20
2y =20-1.5
Y= 9.25
Ans= 9.25
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2 years ago
How much of a spice that is 3% salt should be added to 175 ounces of a spice that is 6% salt in order to make a spice that is 5%
kozerog [31]
<h3>Answer:</h3>

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<h3>Explanation:</h3>

There's a cute "X-diagram" tool that can be used for solving mixture problems of all kinds. (See the attachment.) The numbers on the left represent the percentages of the constituents of the mix. The number in the center is the desired percentage in the resultant mix. The numbers on the right in the X are the differences along the diagonals. (6-5=1, 5-3=2)

These are also the proportions of the constituents in the final mix. That is, there are 2 parts of spice that is 6% salt for each 1 part of spice that is 3% salt. So, we need half as much of the latter as the former.

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If you really want to write an equation, you can let x represent the amount of 3% spice needed. Then the amount of salt in the mix is ...

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... 1050 +3x = 875 +5x

... (1050 -875) = (5x -3x) . . . . . add -875-2x

... 175/2 = x = 87.5 . . . . . . . . . . divide by the coefficient of x

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3 years ago
Read 2 more answers
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