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irinina [24]
3 years ago
7

A chemistry teacher needs to mix a 30% salt solution with a 70% salt solution to make 20 qt of a 40% salt solution. How many qua

rts of each solution should the teacher mix to get the desired result?
Mathematics
1 answer:
fiasKO [112]3 years ago
7 0
The formula should be 0.3x + 0.7(20-x) = 0.4(20)
Simplifying it would get 3x + 7(20-x) = 4(20)
and: 3x + 140 - 7x = 80
then: 4x = 60
x = 15
So then for the 30% solution: 15 quarts
And for the 40%: 5 quarts
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Ms. Mor ris has 35 tests to grade this weekend. Mrs. Cook has 80% more tests than that to grade this weekend. How many tests doe
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8 0
3 years ago
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horsena [70]

Answer:

If,

{3}^{x}  = 2187 \\  =  > x = 7 \\  =  =  =  =  =  =  =

But 3^x ≠ 21875,if x is a whole number.

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8 0
3 years ago
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AysviL [449]

Answer:

1 bag of chips cost $1.25

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2 bags of chips divided by 2 = price for one bag

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3 years ago
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