John has a jar filled with 150 coins made up of quarters and nickels. The total value of the coins is $26.70.

How many quarters and how many nickels are in the jar?

Question

John has a jar filled with 150 coins made up of quarters and nickels. The total value of the coins is $26.70.

How many quarters and how many nickels are in the jar?

anonymous · Answer

answers could be 
75 quarters; 75 nickels
       96 quarters; 54 nickels
       104 quarters; 46 nickels
       54 quarters; 96 nickels

anonymous · Answer

@Dobby1

anonymous · Answer

@Dobby1  @Easyaspi314  help!!

dobby1 · Answer

hey sorry I am late

anonymous · Answer

its cool i already solved this one here is another

anonymous · Answer

Faith mixes 14 liters of 12% acid solution with a 30% acid solution which results in an 18% acid solution.

If x represents the number of liters of 30% acid solution used, which equation can be used to find the number of liters of 30% acid solution in the mixture?

anonymous · Answer

answers could be 
1.68 + 0.3x = 0.18(x + 14)
       2.52 + 0.3x = 0.12(x + 14)
       4.2 + 0.18x = 0.3(x + 14)
       1.68 + 0.18x = 0.3(x + 14)

dobby1 · Answer

I would honestly pick the top one because the answer should have to do with 30% or .3 times the number of liters = 18% or .18 times the liters of 30% acid solution and 12%solution so I think A is the answer. :)

anonymous · Answer

Marie mixes 16 liters of 18% acid solution with a 27% acid solution which results in 21% acid solution.
here is another one

Find the number of liters of 27% solution in the new mixture

anonymous · Answer

answers could be 
        8 liters
       12 liters
       13.7 liters
       16 liter

dobby1 · Answer

do they tell you the number of 21 percent acid solution their is

anonymous · Answer

i dont think so no

dobby1 · Answer

ok looks like we are using the equation we found above this is going to be fun

anonymous · Answer

ok lets make it fun!

dobby1 · Answer

Ok well let me post how the equation is going to look

dobby1 · Answer

$$.18(16)+.27x=.21(x+16)$$

dobby1 · Answer

first we have to multiply the stuff in the parenthasese by what is right next to is

dobby1 · Answer

so that means what we are multiplying is .18*16 and then we have .21*x+.21*16

dobby1 · Answer

so what is .18*16

dobby1 · Answer

you can put it in a calculator

dobby1 · Answer

@manguitar you still there?

anonymous · Answer

yes im sorry

dobby1 · Answer

its fine just tell me what .18*16 equals

anonymous · Answer

1.2 @Dobby1 ?

anonymous · Answer

2.88

dobby1 · Answer

2.88 actually and brb afk

anonymous · Answer

so what would that be in liters

dobby1 · Answer

no the 16 was liters we are supposed to multipy them together

anonymous · Answer

so what would the answer be?
out of the ones i gave you?

dobby1 · Answer

we are not done quite yet to find the answer we have to isolate x

anonymous · Answer

ok

dobby1 · Answer

so now our equation looks like

$$2.88+27x=.21(x+16)$$

anonymous · Answer

ok continue

dobby1 · Answer

the next step is to multiply the x on the right side of the equal sign by .21 giving us .21x

anonymous · Answer

dobby1 · Answer

that gives us 

$$2.88+27x=.21x+(.21*16)$$

anonymous · Answer

ok next

dobby1 · Answer

now what I want you to do for this step is use a calculator to multiply .21*16

anonymous · Answer

3.36

dobby1 · Answer

good now our equation looks like 

$$2.88+27x=.21x+3.36$$

anonymous · Answer

ok next

anonymous · Answer

= 3.57z

anonymous · Answer

@gorv we are working on a different problem

dobby1 · Answer

so now we have to get rid of the .21x my subtracting it from both sides so now use a calculator and do this problem 27-.21

anonymous · Answer

26.79

dobby1 · Answer

good  @manguitar

anonymous · Answer

its all good thank for helping though @gorv

dobby1 · Answer

$$2.88+26.79x=3.36$$

dobby1 · Answer

now I want you to do the following equation in your calculator  3.36-2.88

anonymous · Answer

0.48

dobby1 · Answer

good now our equation is 

$$26.79x=.48$$

anonymous · Answer

ok next

dobby1 · Answer

ok now you need to put the following equation into your calculator .48/26.79

anonymous · Answer

0.01791713325

dobby1 · Answer

hmm

dobby1 · Answer

ok new plan

dobby1 · Answer

we are going to plug in the answer choices they gave you that should work

anonymous · Answer

ok good

dobby1 · Answer

because the answer we got just now is way wrong so here are the answers

dobby1 · Answer

$$.18(16)+.27x=.21(x+16)$$

  8 liters
       12 liters
       13.7 liters
       16 liter

dobby1 · Answer

to solve we are going to have to plug each answer in for x

anonymous · Answer

ok

dobby1 · Answer

so for the first answer our equation looks like

$$.18(16)+.27(8)=.21(8+16)$$

anonymous · Answer

ok next

dobby1 · Answer

when we do all the multiplying we get

$$2.88+2.16=1.68+3.36$$

dobby1 · Answer

then we have to add and that gives us

$$5.04=5.04$$

anonymous · Answer

that seems right

dobby1 · Answer

ok it looks like we are right the answer is 8 liters I would love to help you more but I have to get some school done and eat lunch

anonymous · Answer

ok me too thanks a lot! @Dobby1