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3 years ago

Simplify the expression 15-3(4-2x)-7(x-8)

Mathematics

1 answer:

andreyandreev [35.5K]3 years ago

6 0

15-3(4-2x)-7(x-8) = 15 - 12 + 6x -7x +56 = -x +59

15-3(4-2x)-7(x-8) = - x + 59

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Read 2 more answers

How many liters of 60% alcohol solution should be added to 40 liters of a 20% alcohol solution to make a 50% solution?

kolbaska11 [484]

Answer:

120 liters of 60% alcohol solution is needed

Step-by-step explanation:

Let's assume

x liters of 60% alcohol solution is added

so, we get solution as

$=\frac{60}{100}\times x$

$=0.6x$

we are given

40 liters of a 20% alcohol solution is

$=40\times\frac{20}{100}$

$=8$

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$=8+0.6x$

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$=x+40$

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so, we get

$\frac{8+0.6x}{x+40} =\frac{50}{100}$

now, we can solve for x

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$x=120$

So,

120 liters of 60% alcohol solution is needed

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3 years ago