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3 years ago

Shelly bought 3 kites for $6 each. She gave the clerk $20. How much change will she get?

Mathematics

2 answers:

Dmitry_Shevchenko [17]3 years ago

6 0

Each kite is $2. 6x3 , is 18, so the change she will get for $20 will be $2

Neko [114]3 years ago

3 0

3 kites* ($6/ 1 kite)= $18.

$20 -$18= $2

Shelly will get $2 change~

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3 years ago

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

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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

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

$=8$

so, total alcohol solution is

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now, we can find total solutions

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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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$10x=1200$

$x=120$

So,

120 liters of 60% alcohol solution is needed

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