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Vesnalui [34]
2 years ago
9

It costs 42 dollars for 12 cookies how much is 1 cookie

Mathematics
1 answer:
ArbitrLikvidat [17]2 years ago
3 0

Answer:

$3.50

Step-by-step explanation:

if you divide 42 by 12 you get 3.5

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Find the value of the expression (3⁢x-12)+12⁢(x⁢y-10) for x=4 and y=6 .
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3(4) + 12 + 12[4(6) - 10]
12 + 12 + 12(24 - 10)
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A
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Answer:

The number of liters of 50% antifreeze solution is 50 and the number of liters of 90% antifreeze solution is 150

Step-by-step explanation:

Let

x ----> number of liters of 50% antifreeze solution

y ----> number of liters of 90% antifreeze solution

we know that

50%=50/100=0.50

90%=90/100=0.90

80%=80/100=0.80

x+y=200

x=200-y ------> equation A

0.50x+0.90y=0.8(200) -----> equation B

substitute equation A in equation B and solve for y

0.50(200-y)+0.90y=160

100-0.50y+0.90y=160

0.40y=160-100

0.40y=60

y=150 liters

Find the value of x

x=200-y

x=200-150=50 liters

therefore

The number of liters of 50% antifreeze solution is 50

The number of liters of 90% antifreeze solution is 150

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It is the last one.

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If the average (arithmetic mean) of 2, 7, and x is 12, what is the value of x?
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Answer:

27. (2+7+27=36 36÷3=12) 36=total of the three numbers, 3=Amount of numbers, 12=Average

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Step-by-step explanation:

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