No. Brandon has done better than Andy because Andy scored a 64%, when Brandon scored a 65%
Answer:
3 gallons
Step-by-step explanation:
Let
x ----> the amount of pure acid (100% solution) in gallons
Remember that
we know that
solve for x
therefore
3 gallons of pure acid should be mixed with 3 gallons of a 20% acid solution in order to get a 60% acid solution
you need to find how much the output changes for each unit change in the input. (ie from an input change from 5 to 6 the output changes by three units and an input change of 3 (2 - 5 ) units the output changes by 9 units). This will give you the gradient of the equation. then you have to find out the y intercept by finding what the output is when the input is 0. Do this by multiplying the input by the gradient and then subtracting it from that inputs output. This will give you the answer A) 3x
(Sorry, its a bit wordy :) )
1) Put the x value on the same side of the equation
100= 160-10x+6x
100= 160-4x
2) put 160 on the other side of the equation
100-160=-4x
-60=-4x
3) divide -4 on both sides
-60/-4= -4x/-4
15=x
Hope this helps!
