Question

Can someone plz help me solved this problem I need help plz help me! Will mark you as brainiest!

Answer 1

Answer:

13 l of 15%, 13 l of 25%, 26 l of 70%

Step-by-step explanation:

solutions:

• 15%, 25% and 70%

final solution:

• 52 l of 45%

This includes 0.45*52l= 23.4 l acid

Let's assume:

• amount of 15% solution= x
• amount of 25% solution= y
• amount of 70% solution= z
• and we have z=2y

so there are 2 equation:

• x+y+z=52

• 0.15x+0.25y+0.7z=23.4

or

• x+y+2y= 52 ⇒ x+3y= 52 ⇒ x= 52- 3y

• 0.15x+0.25y+1.4y=23.4

• 0.15x+1.65y=23.4
• 0.15*(52-3y)+1.65y=23.4
• 7.8-0.45y+1.65y=23.4
• 1.2y=23.4-7.8
• 1.2y= 15.6

• y=15.6/1.2
• y= 13 l

--------

• x= 52- 3*13= 13 l
• z= 2y= 2*13= 26 l