He will need 6 2/3 cups of cherries to make 5 cherry pies
Answer:
She should use 91 mL of the 60% solution (rounded to the nearest whole number).
Step-by-step explanation:
The first step to solve this question is to write the correct equations system. The two variables are :
: The amount of high concentration solution (60%) (in mL).
: The amount of low concentration solution (5%) (in mL).
The first equation for the mixing is :
(I)
Where , and represent the percentages for , and the final 500 mL of copper-sulfate solution respectively.
The second equation is :
(II)
The equation (II) represents that the sum from the volumes of high and low concentration solution must be 500 mL.
The final step is to solve this equation system :
From (II) we find that :
(III)
If we use (III) in (I) :
≅
She should use 91 mL of the 60% solution (rounded to the nearest whole number).
<span>the additive inverse of 4x is -4x because if you add them together, you get zero. 4x+-4x=0. And the additive incevse of -5 is 5.</span>
24 hours / 4 hours = 6
6 x 3 lawns = 18 lawns total