math help please ....

Mathematics
Tutor: None Selected Time limit: 1 Day

In the lab, Lucy has two solutions that contain alcohol and is mixing them with each other. She uses 
 times as much Solution A as Solution B. Solution A is  
 alcohol and Solution B is  
alcohol. How many milliliters of Solution B does she use, if the resulting mixture has 
milliliters of pure alcohol?


Number of milliliters of solution B:     ?
May 2nd, 2015

Let solution A = A litres, 13% alcohol, used 4 times

Let solution B = B litres, 10% alcohol, 

Clearly since solution A is 4 times to that of B solution hence, solution A will be 4B litres


13% of 4B + 10% of B = 124

52/100 B + 1/10 B = 124

53 / 100 B = 124

B = 12400/53

B = 234 mili litres

She used 234 mili litres of Alcohol B.

May 2nd, 2015

it's not right

May 2nd, 2015

Wait lemme cross check.

May 2nd, 2015

Let solution A = A litres, 13% alcohol, used 4 times

Let solution B = B litres, 10% alcohol, 

Clearly since solution A is 4 times to that of B solution hence, solution A will be 4B litres

13% of 4B + 10% of B = 124

52/100 B + 10/100 B = 124

62 / 100 B = 124

B = 12400/62

B = 200 mili litres

She used 200 mili litres of Alcohol B.

I am sorry I did a silly calculation mistake, this is the right answer,


May 2nd, 2015

ok since that you did a a mistake can you just answer this one cause they gave to me because of your mistake 

so can you answer itt please ?


Salma invested her savings in two investment funds. The amount she invested in Fund A was 

$8000

 less than the amount she invested in Fund B. Fund A returned a 

7%

 profit and Fund B returned a 

2%

 profit. How much did she invest in Fund B, if the total profit from the two funds together was 

$790

?

amount invested in fund B :    ?


May 2nd, 2015

7%( X - 8000 ) + 2% ( X ) = 790

7/100X - 560 + 2/100  = 790

9/100 X = 790 + 560

9/100 X = 1350

X = 15000................................................Sum invested in B.


Although I corrected my mistake I did this one for free fore next question you need to pay !

May 2nd, 2015

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