What amount of a 75% acid solution must be mixed with a 25% solution to produce 500 ml of a 60% solution?

75% solution: 350ml

25% Solution: 150ml

Step-by-step explanation:

working on first equation:

substitute second equation on the first equation:

3x+500ml-x=1200ml

2x=1200ml - 500ml

x= 350 ml

subtitute this result on the second equation:

350ml + y = 500 ml

y = 150 ml

to prove the results:

substitute both values on first equation:

= 300 ml of pure acid

in 500ml solution = 300ml/500ml = 60% concentration

69

step-by-step explanation:

step-by-step explanation:

given that there are two triangles j'k'l' and jkl>

the former is got by dilating the second one.

when drawn on a grid, (graph paper) coordinates of vertices of first triangle is

(6,12)j, (9,6)k and (12,9)l

side jk has length = distance between j and k

=

side j'k'=distance between j' and k'

=

ie j'k'l' has sides 1/3 of that of corresponding sides of jkl.

hence scale factor of 1/3 is used to get j'k'l'from jkl