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Goryan [66]
3 years ago
7

12 is 15% of what number?

Mathematics
1 answer:
LenaWriter [7]3 years ago
3 0
The 15% is 1.8

All you have to do is multiply 12 by .15 to get the answer, which is 1.80
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William has $12.80 in coins to be deposited in the bank. There are 3 times as many quarters as nickels and 20 more dimes than ni
Natali5045456 [20]

Let the number of nickels be = n

Let the number of dimes be = d

Let the number of quarter be = q

Total money William has = $12.80

As given, there are 3 times as many quarters as nickels

q=3n

And 20 more dimes than nickels

d=20+n

As total money is $12.80

0.05n+0.10d+0.25q=12.80

Putting the values of 'q' and 'd' to find 'n'

0.05n+0.10(20+n)+0.25(3n)=12.80

0.05n+2+0.10n+0.75n=12.80

0.90n+2=12.80

0.90n=10.80

n=12

Hence the number of nickels are = 12

If you want to also find dime and quarter, then

q=3n=3\times12=36

d=20+n=20+12=32





7 0
3 years ago
A scientist needs 10 L of a solution that is 60% acid. She has a 50% acid solution and a 90% acid solution she can mix together
sineoko [7]

Answer:

<u>The equations system is:</u>

<u>x + y = 10</u>

<u>0.5x + 0.9y = 6</u>

Step-by-step explanation:

1. Let's review the information given to us to answer the question correctly:

Liters of 60% acid solution needed = 10

x = Number of liters of the 50% solution

y = Number of liters of the 90% solution

2. Which equation represents the total liters of acid that are needed?

There are two equations needed:

The first one related to the total liters needed, 10 in this case:

x + y = 10

The second one related to the acid concentration of the 10 liters:

0.5x + 0.9y = 10 * 0.6

0.5x + 0.9y = 6

<u>The equations system is:</u>

<u>x + y = 10</u>

<u>0.5x + 0.9y = 6</u>

Solving for x and y in the 2nd equation, we have:

0.5 (10 - y) + 0.9y = 6

5 - 0.5y + 0.9y = 6

0.4y = 6 - 5

0.4y = 1

y = 1/0.4 = 2.5 ⇒ x = 7.5 (10 - 2.5)

The scientist can mix 7.5 liters of the 50% acid solution and 2.5 liters of the 90% acid solution to get the 10 liters of the 60% acid solution.

6 0
3 years ago
Answer this urgently, please!!!!
Inessa05 [86]

Answer:

exact form: 55/256

decimal form: 0.21484375

4 0
2 years ago
Abc=3x+5 cbd=2x+5 find the following m
Monica [59]
Sry idk wish I could know but good luck
4 0
3 years ago
HELP WILL MARK BRAINLIEST TO BEST ANSWER!!!!!!!!<br> I NEED ASAP
Bond [772]
Answer is B

Find perimeter then divide by 3 (because price is per 3 meters) then times by 500 to get the answer
4 0
3 years ago
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